15w SYNTHESIS AND INTERPRETATIONS P. V. KIRCH AND T. L. HUNT PRIOR TO THE MANU'A PROJECIr in 1986, our knowledge of the archaeology and prehistory of the most easterly Samoan islands-Ta'u, Olosega, and Ofu-was rudimentary indeed. Limited recon- naissance survey had revealed the presence of stone- and-earth monuments, especially house platfonns, typical of Samoan settlement pattems on the larger islands (Kikuchi 1963). Attempts at excavation on Ta'u Island by a Bishop Museum expedition in 1962 (in one cave site and two open "cooking-house sites') were disappointing (Emory and Sinoto 1965:40-48), and no stratified materals were discovered that might be used to outline a cultual sequence. Although the Bishop Museum team collected 201 basalt adzes and coconut graters from Manu'a, these were all from surface contexts (Emory and Sinoto 1965, table 2). In short, at the com- mencement of our project, knowledge of Manu'an archaeology was limited to bdef descriptions of urface sites and stone tools, with no time depth. Against this background, our 1986 reconnais- sance work thrughout the Manu'a Group yielded a number of significant advances (Hunt and Kirch 1988). The number and range of surface monuments were extended considerably. Peitaps most impor- tantly, several stratified sites were discovered, two of which on test excavation yielded ceramic assem- blages radiocarbon dated to between 1950-1850 cal B.P. (Hunt and Kirch 1987). These results confirned our initial expectations that the Manu'a Group would prove to have a deep prehistoric sequence extending back to the Ancestral Polynesian phase, quite probably in parallel with the sequence defined for Westem Samoa (Green and Davidson 1969, 1974). The preceding fourteen chapters have presented the detailed results of two subsequent seasons of concentated field and laboratory research at the most promising of the ceranic-bearing sites discov- ered during the 1986 reconnaissance: the To'aga site on Ofu Island. In 1987 and again in 1989 we carried out a progrwn of systematic subsurface sampling of te To'aga area, producing an areal and stratigraphic definition of what is currently the largest and most deeply stratified early site known for the entire Samnoan archipelago. Although our research design was of necessity orented first and forenost to considerations of culrl resource management (i.e., the spatial definifion of the site and assessment of its significance), we have also been able to use this research opportunity to expand on certain aspects of our knowledge of Manu'an-and indeed general Samoan-prehistory. For example, we have fonnulated and tested a model of morphodynamic laape change witfi implications for other coastal sites dtoughout the archipelago. Similarly, our various analyses of artifactual and faunal materials 230 The To'aga Site from the systematic tra excavations have enhanced the weconstncdons of early Samoan material cultu, subience economy, and inter- island exchange. In this concluding chapter, we attempt to integrate these significant new results from the To'aga site with the existing reconstrucdons and interetations of Samoan prehistory, deriving primarily from work in Westem Samoa (Green and Davidson 1969, 1974; Jennings et al. 1976; Jennings and Holmer 1980) and to a limited extent from rcent work on Tutila Island (e.g., Claik and Herdrich 1988; Cark 1989; Leach and Witter 1987; Best et al. 1989). In presenting this synthesis, we are acutely aware that our fieldwork at To'aga has barly begun to tap te immense archaeological potential of this large and complex site. Our excavated sample of 31 m2, while sufficient to give some idea of the extent and range of subsurface deposits and assemblages, represents a very smaU porton of the estimated 21,000 m2 of buried, ceramic-bearing deposits present in the To'aga area. It will take a much larger effort, including the application of time-consuming and costdy horizontal excavation methods, to begin to exploit fully the potential of this site to reveal unknown aspects of the Samoan past. CHRONOLOGY AND CULTURAL SEQUENCE The suite of fourteen radiocarbon age determina- tions from the To'aga site (see Kirch, chapter 6) constitutes the largest set of dates from a single excavation locality anywhere in the Sanoan archi- pelago. These 14C dates define a two-millennium long sequence of coastal tenace formation and occupation beginning ca. 3600 cal B.P. and continu- ing witout pause up to ca. 1000 cal B.P. Although no radiocarbon dates younger than about 1000 cal B.P. were obtained durng our fieldwork, this does not necessarily imply site abandonment dunng the last millenium. Rather, the distribution of radiocar- bon dates from To'aga reflects our emphasis on testing and dating the earlier, deeply buried occupa- tion deposits, as opposed to later surface features. Given the presence of vanous aceramic ocwpation pavements and mounds ('ili'ili pavements), grinding sues, bua'i masi breadfruit storage pits, other surface featues dtoughout the To'aga area, and the presence of historic artifacts (see Hunt, chapter 3), it seems likely that To'aga was in fact continuously occupied by prehistoric Polynesians for a full hee millennia ndeed, this is the only site ecorded to date in the archipelago that appears to encapsulate dre entire prehistoric record of the islands, from initial settlement to historc contact The iming of initial human settlement in Westem Polynesia has been a matter of some contention over the years and is direcdy relevant to cunent debates over the rate of dispersal and coloni- zation of the southwestem Pacific by the makers of Lapita pottery (Kirch and Hunt 1988a,b; Spriggs 1990). Kirch (1988:244, table 48) summarized the radiocarbon evidence for initial settlement of Fiji, Tonga, and Samoa, based on such Lapita sites as Natunuku, Yanuca, Lakeba (Site 197), Naigani, To. 2, and Mulifanua. "Almost all of these [14C] ages cluster between about the twelfth and ninth centuies B.C." (1988:244). The ordy site in Samoa which has yielded dentate-stanped Early Eastem Lapita pottery is Mulifanua, which has a single radiocarbon age of 1280-800 Cal B.C. (based on a A-R value of 100 ? 24, and correcion for the oceanic reservoir effect; see Leach and Green 1989). The To'aga site provides additional new evi- dence for the timing of early, if not iuntial, settle- ment. (This qualification is necessary, because we cannot be certain whether our systematic trascts actually exposed the earliest occupation deposits in the To'aga area. It is a distinct possibility that earlier strata are preserved under the deep colluvium and talus at te inland edge of the site, which could not be penetrated without the use of heavy mechanical equipment.) Our oldest 14C sample in direct, unques- tionable association with ceramics is Beta-35601 from Unit 28, at 1308-930 cal B.C. This age is essentially identical with that from the Mulifanua site and entirely consistent with the suite of dates from other early Westem Polynesian localities. Ihe radiocarbon sample was associated with thinware and thickware pottery, although no dentate-stanped sherds were present. The absence of dentate- stamping in this early context may simply be a function of sampling error (only 8 percent of te Mulifanua cermnics were decorated). Alternatively, it is possible that a stratum bearing dentate-stamped pottery lies furter inland, under the impenetrable Synthesis and Interpretations 231 talus. A third possibility is that e decoraton of pottery with dentate-stamping had ceased prior to the colonization of Ofu. Only furter woik at the To'aga site will be able to discriminate among these altema- tive hypotheses. Despite the absence of "clasic" dentate- stamped pottery, it is clear that Ofu Island and the Manu'a Group were colonized within the same general time penod, between ca. 1200-900 cal B.C., as were Eariy Eastem Lapita sites in Westem Samoa, Niuatoputapu, Tongatapu, Futuna, and Fiji. Given that Manu'a lies at the eastem extreme of the Westem Polynesia region, this finding is quite significant. It implies that the Lapita colonization of the entire Fiji-Westem Polynesian region was accomplished rapidly, with no appreciable lag between sites at the westem and eastem boundaries. The settlement of Manu'a by the close of te second millennium B.C. also implies that Lapita populations were poised at the threshold of the vast eastem Pacific, thus raising again te question of wheher ftere was tuly a "long pause" between fte setde- ment of Westem and Eastem Polynesia (Irwin 198 1; Kirch 1986; Terrell 1986). If highly successful and rapidly advancing island colonizers had moved as far to the east as Manu'a by 1000 B.C., it seems strange that they did not continue eastward into central Polynesia (dte Cook, Society, and Austral archipela- goes) within the next two or thee hundred years. Yet, at present we have no confinned human habitaion sites in central Polynesia dated to the first millennium B.C. (The earliest sites are stfill those in te Marquesas, probably dating to as early as 400- 200 B.C., although this remains controversial, see Kirch 1986.) In sum, while our radiocarbon dates from To'aga confirm the pattem of rapid coloniza- tion of Westem Polynesia by the end of the second millennium B.C., they also heighten the controversy surrounding te subsequent phase of human settle- ment of the eastem Pacific. Another chronological issue of some concem within Westem Polynesia has been the timing of the cessation of pottery manufacture and use. Poulsen's initial claims for a long sequence of pottery manu- facte in Tongatapu have now been revised, and ceranic use appears to have ceased somewhere between about 400 cal B.C. and cal A.D. 50 (Poulsen 1987:83; see also Groube 1971). Based on a large number of 14C dates from several pottery-bearing sites on 'Upolu, Green and Davidson (1974) put the date of pottery disappearance in Samoa after A.D. 300, somewhat later than the Tongatapu sequence. On Niuatoputapu Island, situated between Tonga and Samoa, radiocarbon dates frm Sites NT-93 and -100, containing plainwares, may indicate the persistence of ceramic manufacture and use as late as A.D. 800-900 (Kirch 1988:142, 246). Thus, while tere is a consistent pattem of pottery decline and eventual loss throughout Westem Polynesia, the timing of this process may not be contemporaneous in all locations. At To'aga, the youngest radiocarbon date in direct association with pottery (predominately coarse, thickware) is Beta-35924, at cal A.D. 319- 473. Sanple Beta-26463, which comes from the base of an acermnic midden deposit (in Unit 3), dates tO Cal A.D. 561-663, while Beta-35600 from an aceramic 'ili'ili pavement, dates to cal A.D. 694-943. Thus, the radiometric evidence from To'aga indicates that the cessation of pottery manufacture and use in the Manu'a Group occurred during te fifth-sixth centuries A.D. If Green and Davidson's dating of pottery cessation in 'Upolu to approximately A.D. 300 is correct, there was a lag of 100-200 years in the Manu'a Group. Such chronological differences are certainly not surprising, especially in light of the known ethnographic differences between Manu'a and the rest of Samoa in historic times (Mead 1930, see Kirch, chapter 2). The radiometric chronology developed for the To'aga site now allows the Manu'a Group to be incorporated into a cultual sequence for the Samoan archipelago as a whole. The initial settlement of Manu'a was pene-contemporneous with that at Mulifanua, suggesting that all islands of the archi- pelago were settled faidy rapidly at the close of the second milleMium B.C. Parallel changes in material culture during the following 1500 years are also evidenced (see furiher discussion below), with the cessation of ceramic manufacture in Manu'a possibly lagging behind 'Upolu by one or two centures. One chronological issue not addressed at To'aga is the development of large monumental architecture (such as star mounds and tombs). (We were not pennitted by the landowners to excavate in or near the Tui Ofu monumental complex situated within the To'aga area.) We suspect, however, that as in Westem Sanoa, these features will prove to date to the last 232 The To'aga Site millenniun of Manu'a prehistory. GEOARCHAEOLOGY AND LANDSCAPE CHANGE A major thstof our rsearhprogam at To'aga has been the application of a geoarchaeological and geomorphological approach, in order to address questions of site fomnation prcesses. Given that most of fte archaeological deposits and features at To'aga are deeply buried, a geomorphological approach was essential even for such basic objec- tives as location and subsurface mapping of archaeo- logical deposits. Our aim, however, has been to go furthr and to explore the evidence for both natural and culatal processes of landscape change at To'aga over the thee millennia represented in the prhis- tonc sequence. To this end, a morphodynamic model for the formation of the To'aga coastal terrace was developed (see Kirch, chapter 4) and has been explicitly tested on (1) stratigraphic relationships (see Kirch and Hunt, chapter 5), (2) radiocarbon dates (see Kirch, chapter 6), and (3) sedimentologi- cal analyses (see Kirch, Marning, and Tyler, chapter 7). Here we briefly summarize te major results of this effort, with particular attention to the broader implications for Westem Polynesian prehistory. One specific result of our strategy of systematic trasect excavations at To'aga was the areal defini- tion of te extent of subsurface archaeological deposits dating to the ceramic period. Although our excavation sample is admitedly small, the highly consistent distribution of pottery-bearing deposits in a narrow zone at the base of the talus slope allows us to predict with considerable accuracy the probable extent of these subsurface deposits. These early occupation layers are all associated with former beach-ridge environments, at a time when the shoreline was much closer to the cliff and talus, and when sea level was apparently at a +1-2 m stand. The infenred distribution of pottery-bearing occupa- tion deposits (dating to between ca. 3000-1900 cal B.P.) is plotted in figure 15.1, which also depicts the probable location of the Ofu shoreline during the first milleniuM B.C. It is important to stress, however, that we were unable to determine precisely the inland boundary of these pottery-bearing depos- its, as this lies somewhere under the modem talus slope. Ling heavy mechanical equipmnen, it was impossible for us to penerate fte compact mass of colluvium and talus boulders (estimated to be as thick as 10-15 m in places) which caps the inland portons of these early layers. Probably these deposits do not extend any farther inland than 2040 m from our inland-most test units. Based on the distribution depicted in figure 15.1, te total area of buried subsurface archaeological deposits containing ceramics covers a minimum of 21,000 M2, and a maximum of 35,000 M2. By any Polynesian standards, this is a large site with consid- erable potential for future horizontal excavations. As noted earlier in this volume (see Kirch, chapter 2), the coastal terace nnning along the southem side of Ofu from To'aga to Fa'ala'aga comprises an important land use and resource zone for the island's Polynesian occupants. Given the island's very steep and rugged topography, this stretch of flat land is one of the few areas suitable for intensive arborcultur and for habitation. Yet, our geoarchaeological studies at To'aga clearly demon- strate that this coastal tenrace is a highly dynamic accumulation form which developed into its present configuration only within the past 2,000 years-well after initial human colonization of the island. At the time of initial settlement, the coastal tenrace was very nanrow, consisting of little more than a beach ridge situated directly beneath fte steep oveihanging cliffs and talus. A phase of active progradation of this shoreline did not commence until about 1.9 kyr B.P. This prgradation appean to have been initiated by a rapid fall in sea level (presumably a eustatic fall which is evidenced over much of fte southwestem Pacific at this time, see chapter 4) equalling or slightly exceeding the rate of local subsidence, and thus exposing fte reef flat to erosion and storm surges. The littoral, calcareous contribution to the sediment budget was thereby increased, producing a sufficient volume of sediment to prograde the shoreline between 40-100 meters from its location prior to 1.9 kyr B.P. Following th classification of "accumulation forms" proposed by Zenkovich (1971:95-97, fig. 4.1), the To'aga tenrace is an attached form, specifically type c, a "'tefface formed by the infiling of a concavity (supplied laterally)." In this case, the concavity was formed by the marine cliff inland of the site, which was deepest at the southwestem end of the coastal stip. The infilling Synthesis and Interpretations 233 \ C) * a I 4* / 0 E 0 0 .0 8 *bO 4o 0 H 0 *r E [I C 9o w C0 _w 0 Ct .O 234 The To'aga Site and progradation of the coastal terrace proceeded from southwest to norheast This sequence of infifling is confirmed by our tansect excavations and conrelates withi the early pottery-bearing deposits (daing to 3-1.9 ky B.P.) which are confined to th southwesem part of the To'aga coastal tenre. The norteastem end of the terrace, in the vicinity of Fa'ala'aga Cransect 17), remained a high-energy beach until relatively recently. The morphodynamic model developed and tested for the To'aga site has wider implications for coastal archaeology elsewhere in Samoa and, indeed, on other volcanic oceanic islands (i.e., ose situated on te Pacific Plate). In Manu'a, we would predict that coastl terraces on Olosega and Ta'u islands (for example, the Faga and Saua aeas on Ta'u Island) will prove to have similar dynamic geomorphologi- cal histories to that evidenced at To'aga. lTus, any effort to discover occupation sites dating to the period between ca. 3-2 kyr B.P. will rquire the use of subsurface testing to locate the early beach ridge environments that are prdictably buried under later prograded sediments. We believe that it is likely that such bured sites do exist on Olosega and Ta'u. Indeed, a ceramic-bearing site in precisely this kind of bured beach ridge envirnment was identified by Hunt and Kirch at the base of the marine cliff behind Ta'u Village during our 1986 rconnaissance survey (1988:166-67). The morphodynamic model of the To'aga site is also likely to apply, pediaps with minor modifica- tions, to Tutuila Island. (One modification to the model which may be required is the rate of subsid- ence. Tutuila is somewhat older than Manu'a, and thus may already have passed trugh its phase of rapid subsidence due to point-loading of the thin oceanic crust.) Claik and Herdrich (1988) demon- strat that the 'Aoa Valey has been substantially in- filled since initial human occupation, indicated by a pottery-bearing site situated along the interior edge of the modem valley floor and by other geomorpho- logical signs of a former shoreline now well inland of the present coast. They listed several hypotheses to account for this sequence of infilling (1988:173- 75), including "a lowering of sea level" of about 1-2 m. We would suggest that this hypothesis is the most likely of the alternaives they list, although the contribution of terrigenous sediment to the 'Aoa sediment budget (resulting from human-induced forest clearance and erosion in the interior valley slopes) was doubdess greater ta at To'aga. In any event, the failure of early archaeological efforts to locate ceramic-bearing sites on Tubuila (e.g., Kikuchi 1963; Emory and Sinoto 1965; Frost 1978) was due to the lack of a geomorphologically informed approach to site discovery. It is probable that most if not all of the valley floors as well as the coastal tenrc of Tutuila Lsland have undergone significant infifling and progradation during the past two millennia Thus, early coastal sites are unlikely to be exposed on the surface. It will be essential to woik out local geomorphological sequences of infilling and progradation as an integral part of archaeological survey in these cases. We also predict that similar sequences of progradation and burial of early archaeological sites will be found trughout many of the volcanic high islands of centr Polynesia, particularly in the southem Cooks, Society Islands, and probably the Austals. These are all "hot spot" linear volcanic chains situated on te Pacific Plate, which typically undergo point-loading induced subsidence (Menard 1986:95-99). Steams (1978:286), for example, points to geological and geomorphological evidence for rapid subsidence of the Society Islands during the late Pleistocene (and probably continuing into the Holocene). Furtermore, there is now considerable radiometrically dated evidence for a +1-2 m higher sea level at ca. 4-2 kyr B.P. throughout French Polynesia with a rapid fall to modem level after about 2 kyr B.P. (see Kirch, chapter 4). In short, both of the major controing processes that resulted in coastal terrace construcdon on Ofu (subsidence and sea level change) were probably also operating in central Polynesia. This suggests that early occupa- tion sites will not be easy to discover using conven- tional archaeological surface survey methods. Indeed, the presence of buried, and even partially submerged, archaeological deposits is known for Huahine (Sinoto 1979) and for Mo'orea (Green et al. 1967) in the Society Islands. On Mo'omea, Lepofsky recently discovered anaerobically prerved coco- nuts buried under 2 m of recent alluvium in the interor of the Opunohu Valley (Lepofsky, Haries, and Kellun 1992). These problems of site survey and discovery raise serious issues for Eastem Polynesian prehis- tory. Specifically, given the probability of deep Synthesis and Interpretations 235 burial of early coastal sites, te archaeological record for central Polynesia as curnently defined is likely to be highly biased toward later prehistoric sites. It is entirely possible that the early phases of occupation in the Societies and Cooks have yet to be discovered. Just how far back in time we may be able to extend these chronologies after a program of geomorpho- logically informed, systematic subsurface sampling is launched is impossible to say. It seems conceiv- able, however, that the "long pause" currently identified between the settlement of Westem Polynesia and the movement of people into Eastern Polynesia (Irwin 1981; Kirch 1986; Terrell 1986) may prove to be an artifact of archaeological sam- pling bias. Only a concerted effort to work out the late Holocene dynamics of coastal landforms in central Eastem Polynesia, and to search for early sites in these depositional contexts, will provide a definitive answer to this problem. Although the sequence of coastal tenrace accumulation at To'aga was largely controlled rough the interaction of sea level change and subsidence, it would be a mistake to attribute the entire pattem of landscape change to natural pro- cesses. At To'aga, as throughout much of te tropical Pacific, humans have played a major role in modifying and shaping island environments (see Kirch 1982, 1983, 1984:123-51). One process which is probably due largely, if not wholly, to human interference in the Ofu ecosystem is the erosion and deposition of substantial volumes of colluvium. Our wansect excavations revealed a consistent pattem over most of the To'aga area (except at Transect 17 which has an almost exclu- sively boulder talus underlying the narrow nidge) of increasing rates of colluvial deposition onto the coastal terrace after about 2 kyr B.P. This deposition occurred as a series of small, overlapping colluvial fans emanating out of intermittent watercourses or small ravines inland of the site. These fans cap the early calcareous beach-ridge deposits containing pottery-bearing occupations, and in our inland-most test units frequently exceeded 1 m in depth. The fans rapidly pinch out as they extend onto the coastal tenrace, with the larger angular clastics decreasing in frequency, and thin "tongues" of fine-grained silt and clay extending out onto the coastal flat. That humans played a key role in initiating this incrased rate of erosion and deposition of colluvium after about 2 kyr B.P. is suggested by the presence of charcoal in most of these colluvial sediments. Natural forest fires are an extremely rare occurrnce in te humid tropics, and thus the presence of charcoal flecking in these sediments is almost certainly a signal of human buming (see Kirch and Yen 1982:154, 351-52 for a discussion of this phenomenon on Tikopia Island). This buming most likely was associated with forest clearance for agriculture, specifically shifting cultivation of root and tuber crops on the steep hillsides inland of the site. Once the native forest was disturbed and opened up, erosion of the youthfil volcanic soils on the steep slopes would have increased drnadcally. The effects of this erosion and deposition of colluvium on the newly prograded coastal terrace were by no means negative from the human view- point of potential land use. Rather, the addition of highly fertile, young volcanic sediments to the well- drained calcareous terrace created a mixed edaphic environment that was more suited to the cultivation of tuber and tree crops (such as Dioscorea yams, Alocasia aroids, breadfruit, and coconut), than either the volcanic or calcareous sediments by themselves. Hence, as the coastal terrace itself prograded and expanded in area after about 2 kyr B.P., its potential as a zone of intensive agricultural production was significantly enhanced by the human-induced deposition of volcanic sediments. We can only speculate that the creation of this coastal zone, edaphically well-suited to intensive agriculture as a result of human actions, may have occurred at a time when the island's population was likely to have been increasing after a millennium or so of settlement. Here too, it may not be at all coincidental that the traditional site of chiefly power on Ofu Island-the Tui Ofu monument complex-is situated in the approximate center of this rich resource zone (see Hunt, chapter 3). The emerging chiefly polity of the island could be expected to have exercised its hege- mony by seizing control of this newly created and highly productive resource zone. Other indications of human impacts on te Ofu Island ecosystem in the archaeological record at To'aga include te extinction or extirpation of bird populations (see Steadman, chapter 14) and the intduction of adventive species of terrestrial molluscs associated with Polynesian horficulture (see Kirch, chapter 8). Consideration of this evi- 236 The To'aga Site dence, however, will be deferred to the discussion of te prehistoric subsistence systen in a later section of this chapter. Befoe closing this discussion of the sequence of landscape change at the To'aga site some brief comparisons with other documented sequences frm tropical Polynesia are wamnted. The pattems of change that dramatically wansformed the lowland environment of To'aga between 3 kyr B.P. and e present are not unique to Ofu Island. Similar sequences have been atested for other islands in the southwestem Pacific, including Tikopia (Kirch and Yen 1982), Aneityum (Spriggs 1986), Lakeba (Hughes et al. 1979; Bayliss-Smith et al. 1988), Futuna (Kirch 1975, forthcoming), Mangaia (Kirch et al. 1992) and Niuatoputapu (Kirch 1988). The specific similarties include: (1) the progradation of cosal lowlands between ca 3-1.5 kyr B.P., presum- ably due to sea-level changes in the area; (2) human- induced forest clearance and erosion resulting from shifting cultivation; (3) deposition of alluvial and colluvial sediments in lowland landforms; and (4) edaphic enhancement of lowland environments as a consequence of (3). Also attested in these sequences are human impacts on the endemic and indigenous biota. In short, the To'aga site adds yet another case to the growing catalog of significant human modifi- cations to the island ecosystems of the central Pacific. ANCESTRAL POLYNESIAN CULTURE The derivation of Polynesian cultures from a Lapita ancestor is now well attested in the archaeo- logical sequences of Westem Polynesia. Kirch (1984) and Kirch and Green (1987) have used the tenn "Ancestral Polynesian Culture" (or "Society," depending upon the frame of reference) for the culture which emerged in the archipelagoes of Westem Polynesia during the middle of the first millennium B.C. The reconstruction of Ancestral Polynesian Culture (which doubtess was not unifom troughout the region) is arguably a key task for Polynesian prehistorians, because it provides the baseline against which subsequent cultural divergence, evolution, or transformation can be measured. Such reconstruction may be attempted from at least three different, but complementary, sources of evidence: comparative ehnography, historical linguistics, and archaeology. Green (1986) has oudined this "tiangulation" approach in gater detail using the example of Ancestal Polynesian settlement systans. The To'aga site is potenially a major source of archaeological evidence for the reconstruction of Ancestral Polynesian Culture, because the site's stratigraphic sequence spans the whole of the first millennium B.C., the period duMg which tis Ancestral culue emerged out of its Lapita predeces- sor. Because our objectives and temporal-fiscal limitations necessitated a testing stategy of excava- tion, our present evidence from To'aga is primarily in the realms of material culure and of faunal material bearing on dte subsistence economy. In the fuure, however, expanded horizontal excavations at To'aga may reveal much new evidence regarding the structure and spatial organization of Ancestl Polynesian settlements. Ceramic studies have been an important part of understanding prehistory and culure change in Samoa and West Polynesia. The assemblage from the To'aga excavations is especially significant as it is large, excavated from a well-stratified, well-dat deposit represents the full duration of pottery manufacture in Samoa, and has been studied in detail (chapter 15). Green (1974) perfonned the first detailed analysis of Samoan ceramics from the SU-Sa-3 site at Sasoa'a, Upolu. He defined one "type" with two varieties of plainware: a coarse-tempered thickware, and a fine-tempered thinware. Green (1974) fol- lowed a methodology for classification developed in the culture-historical paradigm of American archae- ology (i.e., especially in the work of J. Ford, A. Kreiger, and I. Rouse; see Dunnell 1986a, 1986b). Contrary to crticisms from proponents of the New Archaeology (1950s-60s), classification fonnulated by culture historians is deductive, problem-oriented, and based largely on a paradigmatic structure (Dunnell 1971). Culture historians understood the explanatory meaning of variability-their methodol- ogy was founded in a materialist ontology (Dunnell 1986b). The debate between Ford and Spaulding in the mid-1950s is illustrative of the contrasts between culture history and the aspirations of the New Archaeology (see Dunnell 1986b). Following the culture historians' lead, Geen (1974) defined two classes of pottery by the Synthesis and Interpretations 237 combination of dimensions in a paradigmatic structre (see Dunnell 1971) for thickness and temper size. Thick- and thinware, as vanreties of one type (in the type-variety system; see Dunnell 1986b: 174), are ideational units or classes. Ide- ational units "are tools of our construction the purpose of which is to allow us to recognize and describe these things about which empirical claims are made" (Dunnell 1986b: 151). Classes are based on intentional definitions, where a specific set of features fonns the necessary and sufficient condi- tions formembership in a unit (Dunnell 1971:16). Once Geen (1974) defined classes for analytic purposes, he described the empirical variability within them. His descriptions include observations such as color, paste texture, temper composition, and surface treatments-attributes that were not part of the defining criteria. Dunnell (1971) has distin- guished definitions from descrptions as the contrast between class and group. Classes comprise lists of criteria; groups are sets of things (Dunnell 1986b:181). Thus, defining classes and describing groups (empirical entities), which he called "catego- ries," characterizes Green's analytic approach. In his analysis, Green (1974) attempted to use the vessel, rather an sherds, as the basic counting unit comprising the archaeological assemblage. This innovative approach to establish a minimum number of vessels based on similarity in sherd color, temper, and other attributes has been attempted by others (e.g., Brose 1970, Sullivan 1983). However, as Feathers (1990:139) explains, attempts to transfonn sherds into vessels are met with some problems. And, such attempts are not always necessary, since variability between assemblages will be reflected in attributes of sherds as well as vessels. As Feathers (1990:13940) puts it, "sherd information is not inferior to vessel infornation. It is just different And because of the problematic representation of vessels archaeologically, sherd data is [sic.] te best source of assemblage infonnation." Green's (1974) minimum number of vessels approach does not lessen the usefulness of his analysis. While later statistical analyses (e.g., Clark and Herdrich 1988; Hunt and Eikelens, chapter 9) revealed problems in the intuitive definition of thick- and thinware, Green's rich descriptions provide data suitable for comparative analysis. In a subsequent study, Smith (1976) took assemblages from the Mulifanua Lapita site, Jane's Canp, and the Paradise site for ceramic analysis. Smith used principal components analysis, a multi- variate grouping procedure, to (1) evaluate Green's conclusions, (2) compare Lapita with later Samoan cermnics, and (3) in his words, "attempt a meaning- ful and useful classification of the pesent Samoan ceramic material using a wide range of both stylistic and techological variables" (1976:83-84). Focus- ing on attributes that appeared to vary temporally, Smith (1976:86) initially soiled sherds into three kinds based on thickness and paste texture: a thick coarse-textured (tempered?) ware; a thinner, finer- textured ware; and an extremely fine textured ware. The distinctions of thickness and paste texture (temper size?) appear identical to those made by Green (1974), with the addition of a finer ware (no doubt due to earlier ceramics in te sample). Smith's (1976) principal component analysis, like Green's pottery descriptions, is a means to delineate the empirical varability of groups. Smith's principal components analysis is not a classificatory tool, however, but a method that analyzes the grouping tendency of the sherds studied. His results show that pottery from these assemblages is relatively homogeneous with respect to the attributes of paste and color. The variables of paste and color are represented in components I and n of his analysis. A third component includes thickness, exterior and interior evenness (variance in thickness?), "filler type" (temper composition?), and "filler size" (temper size?) (Smith 1976:90). While Smith (1976:90) states that "it does not appear possible to interpret this combination of variables in any meaningful fashion," these variables clearly relate to the criteria used to define thick- and thinwares (e.g., Green 1974; Hunt and Erkelens, chapter 9). In analytic terms, Smith (1976) conflates the distinction of group and clas (Dumell 1971). He has not created a classification, but has only shown the grouping tendency of sherds from three assem- blages. Urdike paradigmatic classes, groups (as statistical summaries) change with the addition of every new case (sherd or assemblage). Smith (1976:92) proposes that his groups forn the basis for a new "typology" of Samoan ceramics. He points out, however, that his "types" would serve as descriptive categories only as they do not correspond 238 The To'aga Site to either chronology or spatial distribution. Smith (1976: 93) implicitly recognizes the problem of confladng class and group as he notes that the discreteness of "'types" will disappear with additonal analyses of Samnoan ceramics (see Dunnell 1971, especially pp. 87-110, figure 8). Clearly, analysis of groups does not provide the basis for a useful classification. Istead statisdcal grouping techniques allow one to examine variability among defined classes. Holmer (1980) re-analyzed sherds from Mulifanua, Jane's Camp, and te Paradise site with sherds from two new sites, Potusa and Falemoa, both on Manono Lsland. He attempted factor analysis on unspecified variables-apparently similar or identi- cal to those used by Smith (1976). When factor analysis failed to produce groups (clusters), a new strategy was attempted. Holmer subjectively (implicitly) classified sherds into seven "types." Varables were then selected for observation/ measurement, and data from the analysis of sherds was used in discriminant funcdon analysis. In this analytic procedure, Holmer (1980) simply confirms (statistically) his "subjective" sorting criteria (im- plicit a priori class definitions). As with Smith's (1976) analysis, the ideational (classes) and empiri- cal entities (groups) are confused. Holmer (1980) is thus left with 'lypes" that will constantly change with every new case analyzed. These problems with confusing group and class, evident in Smith (1976) and Holmer's (1980) work, are not merely an academic issue. The conflation of these observational and analydc steps is the reason why Smith and Holmer did not succeed in producing classificatory systems, contrary to their stated objectives. This is because: (1) Analysis of objects is necessarily based on an a priori (most often implicit) classificatory system (i.e., to observe "x" is to observe "x" as a case of something). Grouping procedures are data manipulations performed on unanalyzed and implicit classifications; they are inductive and often formulated as "problem-free." (2) Groups are based on empirical sets (e.g., statisti- cal summaries) that change with every case added, thus an object cannot be assigned to a pre-existing group without altering the "definition" of the unit (3) Grouping provides descriptions of phenomena, but not definitions stipulating necessary and suffi- cient conditions for membership (althoughpost hoc definitions might be extracted). Group membership is based on similarity which vanes in degree. This means that individual objects in a group may share many, some, or in extreme cases, no traits in com- mon (see Dunnell 1971:fig. 8). Clark and Herdrich (1988) recently called attention to the problem of Green's (1974) original formulation of coarse-tempered thickware and fine- tempered thinware. They point to the lack of explicit crteria for what is thick and thin, fine or coarse. Clark and Herdrich (1988) illustrate the variability of these dimensions in an assemblage from 'Aoa, eastem Tutuila. While preliminary in nature, their examination of ceramics points to the importance of classification as a means to document change in te Sanoan sequence. The To'aga ceramic study reported in this volume is the most intensive analysis of assemblage from Samoa to date. The analytic protocol was designed to support the definition of numerous classes (i.e., from two or more of the dimensions) deduced to address particular research questions of the assemblage. While the To'aga assemblage is especially well-studied, much wor remains to answer the larger questions posed by Hunt and Erkelens (chapter 9) for ceramic evolution. Results from To'aga show tha thickware is present in the earliest deposits, and its abundance (in actual numbers) over time is relatively stable. Thinware is never clearly dominant at To'aga. Thinware declines in real and relative abundance over time but persists perhaps as long as pottery production itself. At To'aga, as elsewhere in Samoa, pottery declines in abundance early in the Christian era and then disappears entirely. Results from ceramic compositional analyses show that the bulk of pottery, including both thick- and thinwares, and some carved paddle-impressed ceramics, was produced locally with colluvial "self- tempered" clay source(s) from Leolo Ridge on Ofu. Red-slipped pottery from To'aga does not match the local colluvial clays presently known. Based on this, the red-slipped ware may have an exotic provenance, amving on Ofu through inter-island exchange. Finally, results also suggest that the diversity of raw materials declined over time. Such a pattem if substantiated with furher work, suggests changes in availability and/or procurement of raw material. A decline and eventual end to inter-island exchange of Synthesis and Interpretations 239 ceramics might also be hypothesized. The To'aga assemblage, like most others from Sanoa, is simple in foni and includes very little decoration. Only bowls are represented. Decoration is restricted to impressing and notching on te lip, and on body sherds, red-slip, carved paddle-impres- sion, and incision. This simplicity stands in marked contrast to Lapita assemblages of comparable age from Mulifanua, 'Upolu, and assemblages known from Fuuna, Tonga, and Fiji. Isolation of Manu'a from communities beyond Samoa might account for this stylistic divergence. The To'aga excavations also yielded a small but important set of stone adzes in association with the ceramics just discussed. Significantly, these are all variants of the plano-convex sectioned Type V adz described by Green and Davidson (1969). A dominance of Type V adzes in ceramic-bearing contexts in Westem Samoa was noted by Green (1974:257-58). The Manu'a results confirm this pattem for the eastem part of the Samoan archi- pelago. Indeed, Type V appears to have been a widespread and common form throughout the Ancestral Polynesian region, given the presence of this form in sites in Futuna (Kirch 1981), Niutoputapu (Kirch 1988:192), and Tongatapu (Poulsen 1987:170). Type V was dropped frm the Samoan adz inventory early in the first millennium A.D., and our surface collections from Manu'a are dominated by adzes with quadrangular or trapezoidal cross sections. One of these trapezoidal forms was recovered from a late, aceramic depositional context in Unit 3; this particular specimen appears to have been manufactured at the Tatagamatau quarry on Tutila Island (see Weisler, chapter 12). Pottery and stone adzes are the best documented classes of Ancestral Polynesian portable artifacts. For both of these artifacts, the development of uniquely Ancestral Polynesian forms out of Lapita prototypes has been archaeologically demonstrated (e.g., Green 1971, 1974). This is not the case, however, with another important Polynesian artifact class: the one-piece fishhook. When archaeologists first commenced stratigraphic excavations in the Eastern Polynesian archipelagoes of Hawaii, the Marquesas, Societies, and New Zealand in the 1950s and 60s, fishhooks proved to be among tX most ubiquitous arfifacts. Indeed, in the absence of pottery, Polynesian archaeologists applied their skills at classification and seriation to fishing gear, in an effort to establish chronological sequences (e.g., Emory, Bonk, and Sinoto 1959; Suggs 1961). Thlus, when efforts were directed at the Westem Polynesian islands of Tonga and Samoa, the initial expectation was that similarly rich assemblages of fishing gear would be recovered. These expecations were quickly thwarted by an almost complete absence of fishhooks in Westem Polynesian sites. Poulsen recovered only one "certain specimen" of one-piece hook in his excavations of six sites on Tongatapu (1987:186), while the major Samoan archaeological programme of Green and Davidson (1969, 1974) recovered but a single fragment of a Turbo-shell hook from the Lotofaga midden (Green and Davidson 1969, pl. 23). Kirch's excavations on Niutaputapu fared only slightly better, with four one- piece hooks out of thirteen sites sampled (1988:204, fig. 124). The extreme paucity of fishing gear in Westem Polynesian sites-in contrast with the typically high density of fishhooks in Eastem Polynesian sites- raised a number of questions. Given the extensive scope of Westem Polynesian excavations, sampling enfor alone can be ruled out. Rather, it appears that te rarity of hooks in early Westem Polynesian sites (i.e., those dating to the Ancestral Polynesian period) is an accurate reflection of the relative unimportance of angling gear (Green 1986:131). The faunal assemblages from these sites, however, clearly indicate that inshore fishing was a major component of the subsistence economy. Were hooks being made of pershable materials (such as wood) and hence not preserved in the archaeological record? Were other fishing strategies, such as netting, spearing, or poisoning, prefened over angling by Ancestal Polynesian fishermen? To'aga is the first Ancestral Polynesian site to produce a large assemblage of one-piece fishing gear, and thus demonstrates anoter kind of variabil- ity in eady Polynesian culture. As described in chapter 11, a total of twenty-eight whole or partial Turbo-shell hooks were recovered from our excava- tions, along with another thirty-one prefonns or tabs. This is a fishhook density level much more in keeping with Eastem Polynesian sites. Why should To'aga produce such an assemblage of one-piece hooks when other Samoan and Westem Polynesian sites are devoid of these aftifacts? We suggest that 240 The To'aga Site the answer lies in the differenidal marine environ- ments of the vanous islands. The Westem Samoan islands of 'Upolu and Savai'i, as well as Niuatoputapu and Tongatapu, are all characterized by extensive barrier reef and lagoon ecosystens. In these kinds of coastal environments, the most effective fishing stategies are usually those involv- ing nets (seines, dip nets, nets used with weirs, and other techniques). This was well documented, for example, in ethoarchaeological studies of conten- porary fishing on Niuatoputapu Island (Kirch and Dye 1979; Dye 1980). In contastL the marine environment of Ofu is that of a relatively nanow fringing reef, lacking a broad protected lagoon. In such fringing reef environments, angling becomes a far more significant fishing stategy, to exploit the dominant fish populations of the reef crest and outer slope. The hypothesis that a greater emphasis on angling gear is conrelated with frnging mef (as opposed to barrier reef-lagoon) environments receives some support from fte general Oceanic picre of archaeological fishing gear distribution. For exanple, both Tikopia (Kirch and Yen 1982) and Anuta (Kirch and Rosendahl 1973)-small high islands with narrow fringing reefs-yielded high frquencies of one-piece fishhooks in teir archaeo- logical sites. The same is true of Hawai'i and the Marquesas, where reefs are finging or even lacking altogether. On the other hand, the Society Islands which have extensive lagoons have produced relatively low densities of fishing gear in comparison with other Eastem Polynesian sites. Consequently, we would argue that the Manu'a Group is one area within Westem Polynesia where the marne ecologi- cal conditions favored the use of angling gear. The Turbo-shell fishhook assemblage from To'aga is of some interest from a morphological- stylistic perspective, in addition to its ecological- funcdonal implications. As noted in chapter 11, several of the hooks exhibit morphological features similar to those in eatly Eastem Polynesian fish- hooks. These include the strongly incurved or "bent" shank and the single-notched, line-lashing devices. Thus, the To'aga hooks can madily be identified as a "prototype" stage from which the greater diversity of Eastem Polynesian forms was subsequently developed. THE SUBSISTENCE ECONOMY OF EARLY SAMOA The To'aga excavations produced one of te largest and best preserved faunal assemblages ever recovered from a Westem Polynesian site: 10,209 vertebrate bones and approximately 166.5 kg of invertebrate materials. Largely due to poor prsrva- tion, most previously excavated Samoan sites yielded very poor faunal collections. In Westem Samnoa, only the late prehistoric Lotofaga midden reported by Davidson (1969) and the three coastal sites analyzed by Janetski (1976, 1980)-ceramic- bearing Potusa, Falemoa, and Jane's Camp-have well-preserved vertebrate and invertebrate faunal materials. lTus, the To'aga materials provide the first extensive sample of fauna frm well-stratified and dated contexts spanning the first half of the Samoan sequence. The faunal data have been presented and analyzed by Nagaoka and Steadman in chapters 13 and 14, respectively. Here we expand on their analyses with several general observations and with comparisons to other Samoan and Westem Polynesian sites. One problem that has concerned archaeologists in Westem Polynesia is whether the Polynesian triad of domestic animals-pig, dog, and chicken-was introduced at the time of initial settlement and colonization (Groube 1971; Hunt 1981; Best 1984; Kirch 1979, 1988). At To'aga, only the chicken (Gallus galus) is well represented in our faunal suites. Chicken is actually the most frequent bird species represented in the avifaunal material, with 16 NISP (see Steadman, chapter 14). Chicken bones were especially well represented in the Layer III deposits in Units 20123, dating to ca. 2800-2300 cal B.P. Pig, however, is unambiguously represented only in later contexts (in Layer I of Unit 17). Some of the unidentifiable mammal bone from eadier strata may indeed be of pig or dog-or both-so that the absence of pig and dog in early contexts is not certain. Nonetheless, given the large vertebrate faunal sample and excellent preservation, it is cerain that neither of these domestic animals was ever present in large numbers at the To'aga site. Another adventive species introduced (presum- ably as an inadvertent "stowaway" on voyaging canoes) at the time of initial colonization is the Synthesis and Interpretations 241 Polynesian or Pacific rat, Rattus exulans. This species is ubiquitous in the To'aga strata and occurs in the earliest dated depositional context (Layer HID in Units l5129/30). Tate (1951) discusses the very widespread dispersal of this synanthropic species. Another group of human-intrduced organisms appearing in the early To'aga deposits is the set of five synantrpic terrestrial molluscs discussed in detail in chapter 8: Assiminea cf. nitda, Lanellidea pusilla, Gastrocopta pediculus, Liardetia samoensis, and Lauellaxis gracilis. These species are closely commensal with humans, their preferred habitats being gardens and disurbed environments adjacent to habitation sites. The species are all minute- visible to the human eye only on close inspection- and can only have been tansported inadvertently. Many of these species have also been identified from early, Lapita-associated archaeological contexts on Niuatoputapu Island (Kirch 1988:233-35) and on Tikopia (Kirch and Yen 1982:308-309). As dis- cussed in chapter 8, the most likely mechanism for their inter-island transfer, and intrduction to the Manu'a Islands, was with economic plants and adhering soil media. In this regard, these snails provide indirect evidence for early plant introduc- tions to the island. Indeed, in the absence of direct ethnobotanical evidence for cultigens, the suite of synanthDpic snails is the best clue that the early Polynesian colonists intrduced a complex of economic plants to the island, along with the domes- tic chicken (and possibly also pigs or dogs). Future excavations at To'aga should test this hypothesis through identification of charcoal, carbonized parenchyma, and other carbonized plant materials from earth ovens, hearths, and other stratigraphic contexts. Recent developments in the identification of such carbonized materals by J. Hather (Institute of Archaeology, London; pers. comm., 1991) and others, not available to us at the time the To'aga excavations were undertaken, now make the possi- bilities for such paleoethnobotanical studies possible. Two kinds of larger marine animals are repre- sented in the vertebrate faunal collections: sea urtes and unidentified marine mammal. The sea trtles probably consist mostly (if not exclusively) of the Green Sea Turtle, Chelonia mydas, but definite identifications on the post-cranial skeleton are virtually impossible. Turtle bones were fairly common and were especially frequent in Layer IIIB of Units 20123 and Layer IIB of Unit 19. The marine mammal bone is most likely from one or more species of porpoise. A relatively high fre- quency (18 NISP) of marine mammal bone was found in the early Layer IIIC deposit in Units 15/29/ 30. The bird bones are of particular interest, for they reveal exinctions and extirpations consistent with a pattem of avifaunal change from early sites though- out Polynesia (Steadman 1989; Steadman, Pahlavan, and Kirch 1990, Steadman and Kirch 1990). An unexpected discovery was the presence of two Megapodius sp. bones from Layer IIID of Units 15/ 29/30, the oldest dated layer at the site. Megapodes were not fonnerly known to have been present in Samoa, and this find thus represents an eastern extension of the prehistoric range of this taxon. Given the restriction of this taxon to the earliest stratum, it is likely that the species was rapidly overexploited-to the point of extinction-by the early colonizers of Ofu. Also striking is the presence of bones of six species of seabirds which no longer occur on Ofu Island, including Puwinus pacificus, Puinus lherninieri, Puffinus griseus, Pterodroma rostrata, Pterodroma sp., and Sula sula. The loss of these species from the island within the span of human occupation most likely reflects both direct predation by humans and habitat disturbance. Ninety-four percent of the vertebrate fauna from To'aga consists of fishbone, of which 2,229 NISP were identifiable to family-level taxa (see Nagaoka, chapter 13). Although there are frequency differ- ences in taxa witiin different excavation units, there is remarkable consistency overall in the rank-order dominance of particular fishes. Four families dominate the faunal assemblages: Diodontidae, Serranidae, Acanthuridae, and Holocentridae. These families include numerous species, most of which occur on the reef flat or immediately off the reef edge. They may be taken with a variety of fishing strategies including netting, spearing, poisoning, and angling. The acanthurids, holocentrids, and ser- ranids especially, can be taken with hook-and-line, and it is very likely that the small one-piece Turbo- shell fishhooks recovered from the To'aga site were used to capture these taxa. Of considerable interest is the high frequency of Diodontidae (primarly Diodon hystrix), the porcupinefish. These fishes are known to carry tetradontoxin which can cause severe 242 The To'aga Site illness or even death when ingested by humans. That such a dangerous fish should dominate the To'aga faunal assemblages is cunous, although not inconsistent with pattems in other early Pacific sites (see Green 1986:132). InTikopia, Diodon hystrix was extremely plentiful in the early middens (Kirch and Yen 1982: 292, table 42), as it was also in the Early Eastem Lapita site of NT-90 on Niuatoputapu Island (Kirch 1988:223, table 29). A second tier of fish taxa, in terms of fteir rank- order abundances, comprses the following families: Scaiidae (parrotfish), Carangidae (jacks), Labridae (wrsses), Lutjanidae (snappers), Muraenidae (moray eels), Balistidae (triggerfish), and Osaciidae (boxfish). Again, these are all inshore, reef or reef edge fishes, represented by a large number of species. A varety of fishing strategies were doubt- less employed to take these fishes. A number of other taxa are less commonly represented among te fish fauna assemblages from various excavation units. These are again prmarily inshore fishes, but several exanples from the family Scombridae (nas and mackerels) are present. This is significant, for it does indicate the prctice of pelagic fishing, prob- ably with pearl-shell trolling lures. Trolling for tuna, however, was clearly a minor fishing strategy in terms of its contribution to the total fish catch. In terms of sheer bulk, invertebrates (and especially molluscs) comprise the majority of the faual materials from the To'aga site. (Nonetheless, their contribution of meat to the prehistoric Samoan diet was probably less than that of fish.) In tenns of rank-order abundances based on weighLt a few taxa dominate the assemblages. Consistently the most abundant species is the reef gastropod Turbo setosus; the closely related species T. crassus is also quite common. Only slightly less common is the bivalve Tridacna maxima, which occupies the reef platform. Turbo spp. gastropods comprise on average about 62 percent of the invertebrate faunal suite from the To'aga midden deposits, while Tridacna bivalves constitute anodter 7 percent Other commonly represented taxa include: Trochus maculus, Tectus pyramis, Cypraea spp., Conus spp., Vasum ceramicwn, Cerithium noduloswn, Strombus maculatu, Thais armigera, Asaphis violaseus, and Nerita spp. All of these molluscs occur on the reef platform and reef crest fronting the To'aga site. Sea urchins of several species are also repre- sented in the To'aga middens. The smaller-spined taxa are doubdess underrepresented in our samples, because the spines usually are not retained in the 0.25-inch mesh sieves that we employed. Some indication of their presence was provided by the bulk samples and micro-aftifact analyses of selected sediments (see Kirch, Manning, and Tyler, chapter 7; Nagaoka, chapter 13). The Layer IIIA/IhB occupation in Units 20/23 was noteworthy for an unusually dense concentration of the large slate- pencil sea urchin (Heterocentrotus mamllatus). More an 6 kg of these spines and test fragments were overed from these strata, pardy in associa- don with an earth oven feature. In sum, the To'aga excavations have provided significant new information on which to base reconstnuctions of Ancestral Polynesian subsistence economy, and of the impacts of these early island colonists to the biota of remote Pacific islands. An economic strategy integrating brad-spectrum exploitation of natural faunal resources (marine and tenrestrial) with agricultural producdon is indicated by the To'aga evidence, reinforcing reconstmctions based on other early Fijian and Westem Polynesian sites (Kirch 1984; Kirch and Green 1987). The presence of an extinct or extirpated species of megapode, of six species of extirpated seabirds, and of marine twutle, all in the earliest deposits at To'aga (especially in Layer IhB of Units 20/23), suggest that iniidal exploitation of the island's larger faunal resources may have exceeded te capacity of these naural populations to survive or reproduce under the pressures of intensive human predation. In addition to these early impacts on fte naltura biota, however, te Polynesians radically altered the To'aga area, transforming te coastal environment in particular into a ftoroughly anthropogenic landscape. The purposive inroduction of domestic animals and economic plants, and dte inadvertent introduction of rats, terrestrial snails, and other organisms were the first stages in the conversion of the Ofu ecosystem into a cultumal landscape capable of supporting a dense human population. Following progradation of fte coastal plain after about 1900 B.P., te To'aga area was developed into a highly intensive arboricultural production zone, dominated by economic plants of Polynesian inroduction (coco- nut, breadfruit, aroids, yams, arrowroot, and othes). Even the steep volcanic slopes inland were cleared Synthesis and Interprdatios 243 of native forest and converted to zones of shifting cultivation. Such interior slope modification resulted as well in incrased rates of soil erosion and deposi- tion onto the coastal flats, enhancing the edaphic condition of e latter zone for cmp production. In this regard, the To'aga data add another instance in the rapidly accumulating repertoire of archaeological evidence for prehistoric human transfonnation of Pacific island environments (Bayliss-Smith et al. 1988; Kirch 1983; Steadman 1989). INTER-ISLAND CONTACTS AND EXCHANGE Archaeological research in fte Fiji-Westem Polynesia region has produced some evidence for inter-island contacts and exchange (e.g., Best 1984; Davidson 1977; Kirch 1988). While inter-archi- pelago contacts and exchange are known etho- historically, extensive exchange of ceramics and other materials appears to have occurred in the earliest perod of the region's history. Best (1984), for example, shows that a substantial propordon of early ceramics on Lakeba was imported to the island. While te Tatagamatau basalt quany site on Tutuila (Leach and Witter 1987; Best et al. 1989) is a likely center for adz export, little is known about potential pattems of exchange in Sanoa and the quany's place in a regional system. Excavations at To'aga produced a range of materials for which provenance can be deduced or inferred. Compositional analysis of volcanic rock lithics and adzes, temper and clay of ceramics, and raw materials from potential sources offer a means to explore questions of prehistoric exchange. Weisler (chapter 12) used non-destmctive XRF analysis on ardfacts and potential source rocks from Manu'a and Tatagamatau. His results show that the composition of rock in finished adzes (and in flakes from adzes showing polish) of fine-grained basalt cluster with those from Tatagamatau on Tutuila. In contrast, a relatively coarse-grained dike stone from Fa'ala'aga on Ofu Island is represented only in debitage and simple flake tools. These results suggest that perhaps much, or all local stone was not suitable for adz producdon. Exchange, at least with Tutuila some 100 kn to the west, brought adzes and probably other materials to Manu'a. Hunt and Eikelens (chapter 15) conclude that red-slipped ware, and perhaps other pottery made of clay distinctive from the locally Ikown colluvial sources on Ofu, may reflect imports to the island. The decline in compositional diversity hypothesized for the ceramic assemblage might also indicate that exchange diminished in importance over time. Additional research on sherds from Manu'a and elsewhere in the region is necessary, however, to fully test hypotheses for inter-island ceramic ex- change. THE TO'AGA SITE: CULTURAL RESOURCE MANAGEMENT CONSIDERATIONS As he initial objective of the Manu'a Project was the identification of archaeological sites for purposes of cultural resource management-under contract to the Historc Preservation Office of the Government of American Samoa-it is appropriate to conclude this monograph with a discussion of the significance of the To'aga site, the current status of the site, and the potential impacts which may hreaten its integrity in future years. Site AS-13-1 is unquestionably one of the most significant archaeological sites yet discovered in American Samoa, and indeed, in the Samoan archipelago as a whole. Within American Samoa, it certainly ranks with the extensive Tatagamatau adz quanry complex on Tutuila in tenns of its potential to yield infonnation on the prehistory of the archi- pelago. Some specific aspects of the To'aga site that collectively contribute to its archaeological signifi- cance are enumerated below: 1. Site AS-13-1 incorporates the largest continu- ous area of subsurface archaeological deposits dating to the ceramic phase of Samoan prehistory of any site yet discovered in the archipelago. These deposits are estimated to cover between 21,000 and 35,000 m2 and appear to represent a seres of domestic household units. 2. Site AS-13-1 is well statified, and thus has the potential to yield a finely-detailed chronological sequence of cultral change for the Manu'a Islands. The remarkably deep stratification in parts of the To'aga site contains three or more meters of culural deposits. Because of this stratigraphic record, the 244 The Toaga Site To'aga site presens excellent opporunities for recovering a detailed sequence of artifacal, faunal, and settlement information. 3. Site AS-13-1 spans virully the entire prehistoric sequence of the Samoan archipelago. Initial occupation of the site began around the close of the second millennium B.C., contemporaneous with Xt Mulifanua Lapita site on 'Upolu Island. The stigraphic wecord from ca. 3000 B.C. tO A.D. 800 has been well documerned by our systematic transect excavations, detailed in this monograph. Other archaeological feaus dating to the last one thou- sand years are also present in the area, altough they have not yet been intensively investigated or radio- cartbon dated. No other single site locality in American Samoa has yet produced such a continu- ous occupation sequence spanning the whole of regional prehistory. 4. The preservation of both ardfacts and faunal materals in Site AS-13-1 is excellent, especially in the deeper stratigraphic units, where calcareous (alkaline) sedimentary conditions prevail. The majodty of Sanoan archaeological sites are charac- terzed by acidic soil conditions which do not favor the preservation of such organic materals as bone, shell, or sea urchin spines. In such acidic contexts, cultal materials are usually limited to pottery and stone artifacts. At To'aga, the excellent preservation conditions yield not only ceramic and stone artifacts, but extensive assemblages of bone and shell faunal materials, as well as arfifacts of shell, bone, and sea urchin spine. As a result, our knowledge of early Samoan materal culture and economy has been significantly expanded by te materials from Site AS-13-1. A particular example is the complex of Turbo-shell fishing gear, which for te first time has given us some in-depth information on Samoan angling strategies in the first millennium B.C. Similarly, the faunal assemblages from the To'aga site are the largest-in terms of both numbers and taxonomic richness-from any site yet excavated in the archipelago. 5. Site AS-13-1 also incorporates a number of features of considerable cultural significance to te people of Ofu Island. In particular, To'aga is the taditional seat of the Tui Ofu chiefship, represented by the Tui Ofu well and burial mound (see Hunt, chapter 3). These monuments are held in consider- able awe by the people of Ofu Island and are directly conected to a body of oral tradions (see Mead 1930). Togefter, all of te aspects of Site AS-13-1 enumerated above combine to make this archaeo- logical complex one of the most significant cultural resources in American Samoa, and indeed, in the Samoan Lslands as a whole. The site has already yielded much imporant new infonnation on te prehistory of the Manu'a Group and the Samoan archipelago, and its potential has hardly been tapped. Because of its outsanding significance, we have nominated Site AS-13-1 to the National Register of Historic Places, in conjunction with the Historic Preservation Office of the Govenunent of American Samoa. From te culurl resource management view- point, it is important to assess any potential hreats to te To'aga site. As described in chapter 2, the present mode of land use over most of the site is subsistence gardening in a more-or-less traditional manner (arboriculture and Alocasia aroid swiddening). This relatively low intensity land use does not seriously heaten the integrity of the site, other than for minor impacts to surface archaeologi- cal features such as 'ili'il pavements or lua'i masi pits. There has already been some significant damage to the site, however, trugh the construction of the Public Woiks Department landfill at the southwest- em edge of the site. (Ironically, it was this landfill that led to the original discovery of surface pottery- bearing deposits during the 1986 reconnaissance survey.) It appears that most of the bulldozed landfill pit lay outside of the area of deeply stratified ar- chaeological deposits, but these were disturbed along the inner edge of te bulldozer cut. While the 1986 bulldozing probably did not greatly impact the total site area, it is extremely important that no furxer expansion of this landfill operation occur without prior consultation with the Historic Preservation Office. It should be possible to plan for future landfill needs by situating such landfill pits in the seaward portions of the To'aga coastal fiat tiat do not contain subsurface archaeological deposits. We strongly recommend ta prior to any future landfill operations, the Public Woiks Deparument consult with the Historc Preservation Officer and arrange for limited test excavations to assure that landfill bulldozing take place outside of the zone of buried Synthesis and Interpretations 245 archaeological features. We are unaware, at present, of any other planned developments or constuction in the To'aga area, but if such projects arise, ftey could also have te potential to threaten the integrity of the site. For this reason, it is important that AS-13-1 be placed on the National Register of Historic Places, and that the American Sanoa Historic Preservation Officer attempt to monitor any proposed land use actions in the vicinity of the site. Over the longer tern, te entire archaeological complex at To'aga could be serously thratened by natural coastal erosion. According to the morphodynamic model developed in chapter 4, and tested through various field and laboratory observa- tions, it would appear tha the southem Ofu coastline may have entered a phase of sea level rnsgression. This appears to be reflected along the modem coasdine by active erosion of the beach ridge and associated vegetation line, and by exposure of beach rock. Given that the subsurface archaeological deposits are situated well inland of the present shoreline (between about 40 to 60 m, depending upon the particular locality), such erosion is not at present a serious concem. However, should this transgression phase continue or intensify, for example as a result of global wanming and conse- quent sea level rise (Geophysics Study Committee 1990), the integrity of Site AS-13-1 would ultimately be affected. Continued tectonic subsidence of Ofu Island may itself eventually result in the natural erosion and destruction of the site, but this pocess could be seriously intensified and quickened by rapid sea level rise. Obviously, these are not prob- lems requiring immediate attention, but they should not be wholly ignored either. Fnally, we wish to conclude by briefly drawing attention to some further research possibilities at the To'aga site. While we have been able to use the opporunity of subsurface testing and site survey at AS-13-1 to addess a number of research problems in Samoan archaeology, our investigation of the To'aga site in 1987 and 1989 must be regarded as no more than a pioneering phase. This site has enor- mous potential to add to our knowledge and under- sanding of the prehistoiy not only of Samoa, but of the Westem Polynesian region as a whole. The site is also of sufficient size, with an estimated 21,000- 35,000 m2 of stratified deposits dating to the ceramic phase of Samoan prehistory, that even a large scale excavation program would not remove more than a small percentage of the total area, leaving the majority of the site as an "archaeological bank" for future research. We suggest that the next logical phase of archaeological research at To'aga might be to employ a horizontal excavation strategy to expose one or more larger areas (on the order of 100- 150 m2) within the zone of subsurface deposits dating to the ceramic phase of Samoan prehistory. Our systematic transect sampling suggests that this zone is made up of clusters of domesfic or household residential units, probably consisting of series of dwelling, cookhouse, and possibly other special purpose activity areas. Horizontal exposure of one or more of xse residential units could provide the first clear picture of the setflement layout and spatial anangement of an early, Ancestral Polynesian community. Such a project would be of consider- able interest not only for Samoan prehistory, but for expanding our knowledge of Ancestral Polynesian culture, which is a critical baseline for the develop- ment of later variants of Polynesian culture ough- out the whole Polynesian triangle (Kirch and Green 1987). Obviously, such an expanded excavation program would also need to be combined with oher kinds of rsearch objectives and methods. For example, Weisler's trial application of the non- destructive XRF method of chaacterizing and sourcing basalt artifacts (see chapter 12) could be followed up with a more intensive study, with much potential to reveal patterns of long-distance ex- change at all periods of Manu'an prehistory. Simi- larly, the varation in ceramnics noted at To'aga, such as the distinction between fine thinware and coarse thickware, could be explored along avenues other than just chronological changes in frequency. It may be that these ceramic wares reflect functional, or social, pattems in early Samoan society. These can only be explored through the use of horizontal excavation strategies in which the distribution of ceramics can be closely mapped in comparison to the spatial layout of households. These suggestions are not meant to be an exhaustive catalog of research problems that might be addressed at the To'aga site but simply some possible research directions that we feel would 246 The To'aga Site contnbute significantly to cunrent issues in Polyne- sian archaeology and prehistory. 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New Yoik. Sullivan, A P., III 1893. Storage, non-edible resource processing, and the interpretaton of sherd and lithic scatters in Sonoran Desert lowlands. Journal of Field Archaeology 21:101-114. Tate, G. H. H. 1951. The Rodents ofAustralia and New Guinea. American Museum of Natural History Bulletin 97:187-430. Terrell, J. 1986. Prehistory in the Pacific Islands. Camnbridge: Cambridge University Press. Zenkovich V. P. 1971. A theory of the development of accumulation fonms in the coastal zone. IN J. A. Steers, ed., Introduction to Coastline Development, pp. 94-116. Cambridge: M. I. T. Press. Exploradons on the Makran Coast, Pakistan: A Search for Paradise George F. Dales and Carl P. Lipo. Drawing upon the diary of his 1960 expedition to the remote Makran coast, Dales recounts the search for evidence of commercial and cultural contacts between the ancient Indus civilization (2500 to 1900 B.C.) and the Near East. 1992. paper, 288 pp., 96 plates, 68 figures, 11 tables, and 1 foldout map, No. 50 24.00 The Archaeology and Ethnohistory of Fort Ross, Cal#fornia Vol. 1. K. G. Lightfoot, T. A. Wake, and A. M. Schiff. This new series on the archaeology and ethnohistory of Fort Ross examines the responses of Native Americans to Russian mercantile adctivities in northern California. This volume focuses on the interactions of Native Californians with the Russians and the Native Alaskans. 1991. paper, 250 pp., 33 maps, 12 appendices, 6 pp. of illustrations, No. 49 $18.00 Current Directons in Calfornia Obsidian Studies. Editor Richard E. Hughes, with contributions by Jonathon E. Ericson, Christopher M. Stevenson and Barry E. Scheetz, M. C. Hall and R. J. Jackson, Robert L. 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The authors evaluate whether or not horticulture and sedentary lifeways were adopted widely by coastal hunter-gatherers. 1987. 224 pp., No.46 $9.00 Methods in Artfact Analysis: A Study of Upper Paleolithic Burins. Author Richard N. Dreiman. 1979. 79 pp., No.42 $5.00 Studks in Ancknt Mesoamerica, IV. Editor John A. Graham, with contributions by M. Johnson, E.M. Shook, M.P. Hatch, J.K. Donaldson, P. Mathews, D.M. Pendergast, D.C. Pring, D.S. Rice and P.M. Rice. Collection of papers on the archaeology, architecture and epigraphy of the Maya and the Olmec. 1979. 277 pp., 14 plates, No. 41 $8.00 An Archaeological Assay on Dry Creek, Sonoma County, California. Authors M.A. Baumhoff and Robert I. Orlins. 1979. 244 pp., No. 40 $8.00 For a complete list of titles and ordering information, please write to: Administrator, Archaeological Research Facility, Anthropology Department, University of Califomia, Berkeley, CA 94720. Il z 0 Ing am Mw A