H History and Current Debates of Archaeology in Island Southeast Asia Hsiao-chun Hung Department of Archaeology and Natural History, The Australian National University, Canberra, ACT, Australia Introduction Island Southeast Asia (ISEA), situated between Mainland China, Mainland Southeast Asia (MSEA), and Oceania, has been among the world’s most significant passageways of human migrations since more than one million years ago (1 Ma). Hominids such as Homo erectus lived in Java at least as early as 1.2 to 0.8 Ma. The high diversity of landscape, population, and culture in ISEA makes it an attractive place for archaeology, especially regarding issues such as the origins, dispersal, and interaction of ancient populations at different time depths and geographic routes. One challenge, though, has been the fragmented nature of the archaeological record here, well documented in some cases while under-studied in other areas. As almost every region in ISEA has been colonialized by external countries, the discipline of archaeology has developed with influence from those imposed political systems. Some distinctions can be noticed before and after © Springer Nature Switzerland AG 2019 C. Smith (ed.), Encyclopedia of Global Archaeology, https://doi.org/10.1007/978-3-319-51726-1_3373-1 World War II. At different times, the Philippines were claimed by Spain and the USA, Malaysia was under British authority, Indonesia was controlled by the Netherlands, East Timor was ruled by Portugal, and a broad and diverse expanse of the region was occupied by Japan. This entry offers a large-scale view of archaeological practice in the region of ISEA. First, the history of the discipline is reviewed, from its inception through the present day. Next, key research issues and debates are identified, such as regarding the formation of the major populations of cultural groups living in ISEA during different periods of human evolution. Special focus here is given to the ongoing questions about the origins and dispersals of the Austronesian groups, involving input from archaeology, linguistics, genetics, and additional studies over the last few decades. This review provides a basis to consider international perspectives and future directions of archaeology in ISEA. Definitions In this entry, the region of Island Southeast Asia (ISEA) extends from Taiwan in the north and continues southward through the Philippines, Island Malaysia (including Sarawak and Sabah of Eastern Malaysia, plus Brunei), Indonesia, and East Timor. 2 History and Current Debates of Archaeology in Island Southeast Asia History of Regional Research The development of archaeology in ISEA traditionally has been divided into three major stages (see Tsang 2000; Chia 2017; Paz 2017; Simanjuntak 2017a). The early years of the discipline have been described as an emergent period, leading up to (and in some cases continuing into) World War II (WW II: 1939–1945). Next, a transitional period has been mentioned as operating after World War II (1945) and lasting until the 1970s. The current status of regional archaeology has been considered as a continuation of a developmental period since the 1970s. Emergent Period, Before World War II As was the case in many parts of the world, the earliest archaeology activities in ISEA were due to the adventures of foreign travelers in the habit of collecting antiquities. The initial pioneering forays were designed to learn the baseline scope of archaeological sites and artifacts in each area, for example, as potentially could be displayed in a museum. These explorations began as early as the 1800s, at a time when the discipline of archaeology was just beginning to take shape internationally. Formally proclaimed as a British Colony in 1867, Malaysia witnessed archaeological inquiries earlier than most other countries of ISEA. Visiting researchers explored the rainforests and caves, and some of the region’s first museums were established. Sarawak in particular attracted attention at the Niah and Bau Caves, studied in 1873–1878 by Alfred Hart Everett, Charles Darwin, Alfred R. Wallace, and Thomas H. Huxley (Harrisson 1954). Slightly later, projects were launched at caves along the east coast of Sabah, studied by C.V. Creagh in 1888–1895 (Rutter 1929: 217). Two of the oldest traditions of ISEA archaeology were stablished as the Sarawak Museum in 1886 and the Sarawak Museum Journal in 1911. Indonesia has attracted natural scientists and curious collectors since Dutch control of the region as early as the 1600s, although archaeology specifically became more popular after major discoveries of the late 1800s. The key turning point for archaeology began with the historic finds of hominin fossils, Pithecanthropus erectus (later H. erectus), recovered by Eugène Dubois at Trinil, East Java in 1891 (Fig. 1) (Dubois 1896). Since then, several other Homo erectus discoveries have been reported, such as the fossils at Ngandong and the findings associated with stone tools of a “Sangiran flake industry” at Sangiran. Meanwhile, archaeology research offices were established, notably including Oudheidkundige Dienst (archaeological office) (Simanjuntak 2017a). Between 1931 and 1937, H. R. van Heekeren worked with W.J.A. Willems in East Java and South Sulawesi, and then 2 years later (in 1939) van Heekeren started the first excavation in Indonesia at Kedeng Lembu, Jember (Glover 1974). Farther south, in today’s East Timor, Alfred Bühler conducted the first excavation there in 1935 (Sarasin 1936). The first discovered archaeology site in Taiwan, Zhishanyan in Taipei Basin, was reported by Japanese school teacher Awano Dennojou in 1896. Before 1949 when the Chinese archaeologists moved from mainland China to Taiwan, Japanese scholars had discovered more than 100 prehistoric sites in Taiwan and surrounding islands. One of the most influential figures of that period was Tadao Kano, known for discovering numerous sites and for developing the first archaeological chronology of Taiwan (e.g., Kano 1946, 1952) (Fig. 2). Philippines archaeology can be traced back to the early 1920s. H. Otley Beyer, an American anthropologist who later shifted to archaeology. Beyer conducted several excavations in Novaliches, and he collected large numbers of artifacts especially from Rizal, Bulacan, and Batangas of southern Luzon (Beyer 1926, 1947, 1948). Beyer was the first scholar to build a chronological narrative of material artifact categories in the Philippines. Until now, Beyer’s chronology has influenced the thought and practice of Philippines archaeology. Transitional Period, from World War II (1945) Through the 1970s After World War II, archaeology as a discipline transformed worldwide, including major change History and Current Debates of Archaeology in Island Southeast Asia 3 History and Current Debates of Archaeology in Island Southeast Asia, Fig. 1 The Solo River at Trinil in East Java where Eugène Dubois discovered the first Java Man (Homo erectus) in 1891. (Image source: Hsiao-chun Hung) History and Current Debates of Archaeology in Island Southeast Asia, Fig. 2 Pinglin jade workshop in Hualien of eastern Taiwan (at least 46,000 square meters with very dense worked-jade deposit), first discovered and excavated by Tadao Kano in 1929, is so far known the largest jade workshop in Southeast Asia. (Image source: Hsiaochun Hung) not only in political influence but also in broad aspects of theory, method, and technique. Most countries in ISEA transferred into new political status and associations, with direct influence on how archaeology could be practiced and on how the research findings were perceived in national and international narratives. Meanwhile, profound impacts in archaeology developed in philosophical thought, as well as in the science of excavation procedures. Overall during the decades of the 1940s through 1970s, archaeology became accepted as a way to learn concrete evidence directly from the past. Controlled excavations proceeded in carefully exposing individual geological and sedimentary layers, each associated with a measured time period and characterized by a set of tangible objects. Chronological sequences became even more robust after the availability of radiocarbon dating since the 1950s. 4 History and Current Debates of Archaeology in Island Southeast Asia At the end of the Chinese Civil War (in 1948), a group of Mainland Chinese archaeologists moved into Taiwan with the Kuomintang (KMT) government of the Republic of China. Those scholars mostly had worked in northern China, and they brought their experience into Taiwan while forming the first archaeology division of the Institute of History and Philology (IHP) at Academia Sinica. LI Chi became the first head of this archaeology division at IHP, and furthermore he established the Department of Archaeology and Anthropology (now re-named Department of Anthropology) at National Taiwan University in Taipei. In the Philippines during the 1950s through 1960s, American archaeologist Robert Fox conducted the first two systematic archaeological excavations, aiming to delineate the chronological sequence of artifacts in dated archaeological layers. One project was at Calatagan in Batangas of southwest Luzon (Fox 1959), and another was at the Tabon Cave Complex in Palawan (Fox 1970). The results supported a long-term chronological narrative that outlined thousands of years of cultural history, starting with ancient huntergatherer sites and continuing through later historical contexts. In Sarawak and in Sabah of Malaysia, Tom Harrison organized excavations at several caves during the 1950s through 1960s, with special emphasis at the Niah Caves of Sarawak. The project at the Niah Caves expanded to accommodate input from paleontology, zoology, geology, botany, and radiocarbon dating (e.g., Harrisson 1957, 1958a, b, c, 1959a, b, 1967, 1968, 1970). Harrison explored caves along the east coast of Sabah (Harrisson 1973), yet the project at Niah Caves consistently attracted the most international attention for the numerous burial findings that extended through several thousands of years. After World War II, H.R. van Heekeren returned to Indonesia in 1945, continuing his prior studies with new techniques and motivation. He completed his major works for outlining the chronological sequence of Indonesia and for describing the artifacts belonging to the individual time periods, especially concerning the Bronze–Iron Age of Indonesia (van Heekeren 1958) and the Stone Age of Indonesia (van Heekeren 1972). From 1950 until leaving Indonesia in 1956, van Heekeren trained new staff for the archaeological office, while he undertook several excavations with R.P. Soejono at Anjar in West Java, at sarcophagus burials in Bali, and at cave sites in Flores and Centeral Java (Glover 1974). During the decades leading up to the 1970s, archaeology in ISEA for the most part was performed by foreign researchers, while those projects created opportunities for the first generations of local scholars. Among those local scholars were Wen-Hsun Sung in Taiwan, Alfredo E. Evangelista in the Philippines, and R.P. Soejono, T. Jacob, and S. Sartono in Indonesia. Soon, they assumed the responsibilities for archaeological investigations and museum programs in their home countries. Developmental Period, Since the 1970s and Continuing Now Since the 1970s and continuing now, two aspects have characterized archaeology in ISEA, mirroring worldwide trends. One aspect has involved the development of new schools of thought in how to perceive of the archaeological record and how to formulate questions of relevance for broader social studies such as in the field of anthropology. Another aspect has involved the increasing role of indigenous scholars in shaping the practicalities of archaeology in each country. In Taiwan, one of the major influential projects occurred during the 1970s, known as the Interdisciplinary Cooperation Research Plan for the Natural and Cultural History of the Zhuoshui River and Daduxi River Basins in Taiwan Province. The project was developed by Taiwanese archaeologist K.C. Chang, who had received formal Ph.D. training at Harvard University in the U.S., in collaboration with the local Taiwanese scholar Wen-Hsun Sung. During the years of 1972–1976, this project linked archaeology with ethnology, geology, landscape ecology, zoology, botany, and pedology. The results greatly strengthened the baseline of chronological studies in Taiwan, and furthermore archaeology was situated prominently within an interdisciplinary context. Meanwhile, archaeology in Taiwan grew in History and Current Debates of Archaeology in Island Southeast Asia its international standing, owing to a number of unique characteristics of the local cultural traditions linking between Mainland East Asia and ISEA, with further implications of linking with Pacific Oceania, all potentially studied through the archaeological record. In the Philippines since the 1970s, archaeology projects have continued at a number of key sites, viewed as representative or perhaps even iconic of the region’s cultural history. Multi-disciplinary teams have incorporated archaeology as part of studying sites of Palawan, led by the National Museum of the Philippines (Peralta 1983), and this particular area attracts an ever growing number of archaeologists with different research interests. Archaeology has been the central or sole focus of studies in other regions of the Philippines, for example in northern Luzon, involving the discovery of ancient animal bones and stone tools in the Liwan Plain (Fox and Peralta 1974; Shutler and Mathisen 1979; Wasson and Cochrane 1979), the deep excavations for disclosing many thousands of years of human presence at the Peñablanca Caves (e.g., Ronquillo 1981; Thiel 1986a–1987, 1988–1989; Mijares 2005, 2006a, b; Mijares et al. 2010), and the excavations within and extending deep beneath the extensive shell middens along the Cagayan River (e.g., Cabanilla 1972; Thiel 1986b–1987; Aoyagi et al. 1993, 1997; Ogawa 2002a, b, 2005; Tanaka 2002, 2004; Hung 2005, 2008). So far, more than 30 sites in the Cagayan Province have revealed layers spanning through the last few thousands of years of changing pottery and other artifacts, thus providing substantial detail about the regional archaeological sequence (Fig. 3). During the 1970s and 1980s, local Malaysian scholars began to receive overseas academic training in Australia and elsewhere, and they returned to Malaysia as the first generation of archaeologists shaping the discipline internally. Their primary interests were in outlining the local chronological sequence and then refining specific aspects of the sequence to address particular questions such as about the ancient lives of huntergatherers, the emergence of pottery traditions, the development of sedentary societies, and more (Chia 2017). Among the first local scholars, 5 Zuraina Majid provided new understanding of the Malaysian archaeological sequence and food resource economy at Niah, based on her primary excavations in 1977 (Majid 1982). Adi Haji Taha’s excavations at Gua Cha and other sites documented the long narrative of human presence since more than 10,000 years ago and continuing through the modern-day Orang Asli (e.g., Taha 1985, 1987, 1991). In 1995, the Center for Archaeological Research Malaysia at the University of Science Malaysia was established, and so far it has produced more than 15 Ph.D. and 30 M.A. graduates (Chia 2017), while serving as the leading archaeology institute and authority of the country (Fig. 4). Since the 1970s in Indonesia, archaeology has been increasingly important in government policies, national identity, and international relations. In 1975, the Institution of Archaeology and National Heritage (Lembaga Penelitian Purbakala dan Peninggalan Nasional) was divided in two new entities, including the Directorate of History and Archaeology (Direktorat Sejarah dan Purbakala) for the duty of protection and conservation, and the National Research Center for Archaeology (Pusat Penelitian Arkeologi Nasional), for the purpose of research. Since then, the National Research Center for Archaeology has undertaken innumerable national archaeological projects, as well as collaborations with visiting international teams (see Simanjuntak 2017a). Among the many significant findings have been the definition of Acheulean stone tools in Sangiran, central Java (e.g., Simanjuntak and Forestier 2008; Simanjuntak 2011), of Homo floresiensis at Liang Bua, Flores (e.g., Brown et al. 2004, Morwood et al. 2004; see below), of rock art in Maros, Sulawesi (Aubert et al. 2014) and in Borneo (Aubert et al. 2018), of a large burial complex of Australo-Melanesian and East Asian populations of two layer formation at Harimau cave, South Sumatra (Simanjuntak 2016; Matsumura et al. 2018) (Fig. 5), and of early pottery-bearing sites in the Karama Valley in Sulawesi (e.g., Simanjuntak 2008; Anggraeni et al. 2014). The above-mentioned research projects (among many others not detailed here, due to the 6 History and Current Debates of Archaeology in Island Southeast Asia History and Current Debates of Archaeology in Island Southeast Asia, Fig. 3 One of the large shell midden sites, Magapit shell midden, located in Lal-lo, Cagayan, northern Philippines. (Image source: Hsiao-chun Hung) History and Current Debates of Archaeology in Island Southeast Asia, Fig. 4 The field station at Lenggong for intensive field research in this region undertaken by the Center for Archaeological Research, University of Science Malaysia. (Image source: Hsiao-chun Hung) space limit), have contributed to our baseline understanding of archaeology in ISEA, and they have provided the essential core data for guiding new investigations. Some of those projects have been ongoing and continually re-shaping with new generations of archaeologists. Inevitably, interpretations of the data have been variable, in some cases creating the grounds for academic debates. Key Issues and Current Debates In ISEA, several archaeology research issues of global significance have been controversial, leading to debates among scholars and shaping much of the published literature. Perhaps the most enduring debates have revolved around the dating and context of Homo erectus fossils, the History and Current Debates of Archaeology in Island Southeast Asia 7 History and Current Debates of Archaeology in Island Southeast Asia, Fig. 5 The Harimau cave in South Sumatra, so far more than 80 human remains belong to two layers of ancient populations (the earlier Australo-Melanesian and the later East Asian-Austronesian) have been discovered. (Image source: Hsiao-chun Hung) appearance of the first anatomically modern human (AMH) or Homo sapiens in the region, and the development of cultural groups today known as the Austronesian people. Homo erectus in ISEA: Dating, Craniometric Variation, and Relation with Fossils in Northern China Fossils of Homo erectus in Indonesia have prompted questions about how long ago these ancient hominids reached into ISEA, how they related with other groups of their species in other regions, and what happened later with the appearance of anatomically modern humans (AMH or Homo sapiens). The major fossil findings in ISEA have been in Java, at sites such as Trinil, Sangiran, Mojokerto, Sambungmacan, and Ngandong. Dating has been imprecise, relying on approximations of the ages of associated geological layers, but the age range overall has been congruent with Homo erectus in other regions, as old as 1.2–0.8 Ma and continuing at least through 0.75–0.4 Ma. In a global view, Homo erectus as a species has been regarded as an ancient and now extinct hominid, including some members of the species who had migrated from Africa into Asia and evidently as far as Indonesia in ISEA, prior to the evolutionary appearance of Homo sapiens. Any findings of Homo erectus fossils can offer insights into our ancient evolutionary history. The findings in ISEA in particular deserve close attention about the possibility of localized variation within the species, given the geographic distance from other areas where Homo erectus had lived. The fossils of Homo erectus in Java have exhibited some variation in their forms, and accordingly scholars have argued about what those morphological differences could imply or represent (e.g., Weidenreich 1943; Antón 2002; Baba et al. 2003; Kidder and Durband 2004; Zeitoun et al. 2010). Some scholars have proposed that Homo erectus had evolved with distinctive physical traits uniquely in Java, while other scholars have proposed a population replacement by other members of the Homo Genus. Currently, the evidence points to 8 History and Current Debates of Archaeology in Island Southeast Asia a long-term unbroken continuity of Homo erectus in Java (Kaifu 2017), yet this framing still could allow for debates about how much physical variation can be accepted within the overall definition of a biological species such as Homo erectus. The Homo erectus fossils in Java definitely look different from the counterpart fossils of the same species as reported in China, specifically in Zhoukoudian at 0.75–0.4 Ma (see Shen et al. 2009; Antón 2002). Measurements of cranial morphology reveal that the faces looked different among those individuals in different regions. These variations are difficult to interpret, to some extent constrained by the small numbers of individuals that can be represented in the fossil records. The key point of debate has been about how to view the range of variation as occurring within the biological species or else suggesting distinctively separate variants or even perhaps subspecies. Appearance of Anatomically Modern Humans (AMH or Homo sapiens) in ISEA: Timing, Migration Routes, and Number of Migrations In ISEA, the appearance of anatomically modern humans (AMH or Homo sapiens) relates with several significant questions. First of all, when did the species enter into the region? Related with this first question, what was the migration route, and were multiple routes possible? Could more than one migratory event have occurred? Furthermore, how did the members of the Homo sapiens species interact with other members of the Homo Genus in different areas? The dating issue can be framed within the parameters of when Homo sapiens first dispersed from the African continent and then when their descendants definitely had reached as far as Australia and New Guinea. The oldest evidence of Homo sapiens outside Africa could be interpreted as perhaps 100,000 years ago in the Israel, thus constituting an oldest bracket for the possible dating of the species entering into ISEA. Equally important, human remains have been confirmed in Australia about 50,000 years ago (noting older dating still under debate), supported by further evidence of stone tools in New Guinea within the range of 47,000–42,000 years ago, thus indicating that Homo sapiens must have passed through ISEA by that time and perhaps much earlier. Given those time brackets, Homo sapiens first may have migrated into ISEA at some time between 100,000 and 50,000 years ago. Ancient remains of Homo sapiens have been reported at several sites in ISEA, but dating has been problematic with poor preservation and contextual association in many cases. From Fox’s excavations in Palawan of the Philippines, human remains have produced dating of approximately 47,000 years ago by Uranium series (Detroit et al. 2004). Also in the Philippines, a metatarsal element from Callao Cave in Peñablanca of northern Luzon has been suggested as belonging to Homo sp., dated at 66,700 years ago by Uranium series (Mijares et al. 2010) (Fig. 6). The “Deep Skull” of the West Mouth of the Niah Caves in Sarawak, East Malaysia, has been dated to approximately 40,000 years ago (e.g., Harrisson 1959a, 1970; Brothwell 1960; Kennedy 1979; Barker et al. 2007). In Indonesia, bones of early Homo sp. have been reported at Punung (Storm et al. 2005) and Wajak in Java about 37,000–24,000 years ago) (Storm et al. 2013), as well as at Lida Ayer in Sumatra about 73,000–63,000 years ago) (Westaway et al. 2007). These early findings of Homo sapiens in ISEA could be questioned on technical grounds. For instance, radiocarbon dating so far cannot extend beyond 50,000 years ago, and therefore any older dating must rely on other procedures with inherently wider error ranges of several thousands of years. Additionally, some of the taxonomic identifications have been challenged, such as the metatarsal fragment at Callao Cave in the Philippines, possibly attributed to a species other than Homo sapiens with similar metatarsal structure (O’Connell et al. 2018). Ongoing research programs have been investigating issues of Archaic Hominin populations and early Homo sapiens in ISEA. Researchers have sought to clarify and refine the dating, biological affinities, geographic extent, and contexts of extinction of various species of the Homo Genus. Among the most notable examples have History and Current Debates of Archaeology in Island Southeast Asia 9 History and Current Debates of Archaeology in Island Southeast Asia, Fig. 6 The Callao Cave in Peñablanca of northern Luzon of the Philippines has produced Homo sp. (?) dated as 66.7 1 ka. (Image source: Mike T. Carson) been the studies of fossils of Homo floresiensis in Flores Island of eastern Indonesia (e.g., Brown et al. 2004; Morwood et al. 2004, 2005; Jacob et al. 2006; Morwood and Jungers 2009; Brown and Maeda 2009; Kaifu et al. 2011, 2015a, b; Kubo et al. 2013; Henneberg et al. 2014; Sutikna et al. 2016; Brumm et al. 2016; van den Bergh et al. 2016), as well as the studies of ancient DNA suggesting admixture between modern and archaic (premodern) hominins such as Denisovans (e.g., Reich et al. 2011; Cooper and Stringer 2013; Kaifu 2017). Formation of Major Cultural Groups in ISEA: Cultural History of the Austronesian-Speaking Populations Another enduring debate in ISEA archaeology has involved notions of how the region’s different cultural groups and traditions came to exist, possibly through a series of migrations and interactions. Central to these debates, scholars have considered how the modern-day Austronesianspeaking groups came to be so broadly distributed all across the region and extending farther into Madagascar and into Pacific Oceania (Fig. 7). Much of the scholarly interest at first was pursued through studies of language history and living cultural traditions, and archaeology was added into the debates mostly since the 1970s. Many of the disagreements among archaeologists can be traced back to the 1970s or even earlier, prior to the availability of the most relevant archaeological data in the region. Currently, the archaeological records have developed with considerably more refinement than was possible in the 1970s, and meanwhile physical anthropology and other lines of evidence have provided additional supporting information. Two quite different hypothetical models have been proposed about the origins of modern Southeast Asian populations, now known as the Regional Continuity Model and the Two-Layer Hypothesis. The Regional Continuity Model proposes that modern Southeast Asians developed in situ from local ancestors without significant incoming genetic admixture (e.g., Turner 1990). The Two-Layer Hypothesis argues that SEA was occupied initially by groups such as the 10 History and Current Debates of Archaeology in Island Southeast Asia History and Current Debates of Archaeology in Island Southeast Asia, Fig. 7 Children of IlocanoAustronesian in Alaguia, Lal-lo, Cagayan of northern Luzon, Philippines. (Image source: Hsiao-chun Hung) Australo-Melanesian populations, and then later substantial genetic admixture occurred with East Asian immigrants who brought farming and other innovations into the local cultural inventories (e.g., Jacob 1967). Recently, the Two-Layer Hypothesis has gained solid support from bioarchaeology studies of cranio-morphometric comparison (e.g., Matsumura et al. 2018, in press) and ancient DNA studies (e.g., McColl et al. 2018). These studies concluded an earlier layer of Australo-Melanesian groups and a second layer of East Asian groups. The research themes about the Austronesian origins and dispersals have been at the center of numerous projects all across ISEA for the last few decades. The related issues and debates can be complicated, and they are treated in more detail here in terms of the development of archaeology as a discipline in ISEA. Academic Debates of Austronesian Origins As the Austronesian-speaking populations comprise the majority of the modern ISEA communities, their origins and homelands have been subjected to ongoing debates among scholars of different fields (e.g., Bellwood 1997, 2005; Oppenheimer 2004; Tsang 2005; Solheim 1988, 2006; Barker and Richards 2013). Numerous hypothetical models have been contradictory, and many have failed to refer to convincing evidence. The two most influential models provided by archaeologists have been the Nusantao Maritime Trade and Communication Network (NMTCN) Model and the Farming-language Dispersal Hypothesis (aligned with the Out of Taiwan Model). The Nusantao Maritime Trade and Communication Network Model A popular model has persisted as the Nusantao Maritime Trade and Communication Network (NMTCN) Model, despite no actual archaeological or linguistic evidence in support of it. The intellectual basis refers to the strong sea-faring traditions in ISEA, noting that people for several centuries have been highly skilled long-distance navigators. Solheim (e.g., 1988, 2006) described these people as the Nusantao. Some groups have been known as sea nomads, ranging over vast expanses of the region. The NMTCN model involves more than just the movement of sea-crossing experts, and it explicitly calls for a locus of cultural origin activity within the central to southern provinces of ISEA, expanding radially from there into the farther edges of the region. In this view, Taiwan could not have been the origin of the population movements, and thus it disagrees with the Out of Taiwan Model. Moreover, the traditions of History and Current Debates of Archaeology in Island Southeast Asia sea-crossing networks are described as originating long prior to a pottery-bearing horizon and predating the Austronesian-speaking groups. In one variant of NMTCN Model, Meacham (1988) proposed that Austronesian languages and other cultural traits evolved locally within a large triangular area with apex points at Taiwan, Sumatra, and Timor. The pottery-bearing horizon could be seen as emerging within this large region overall, termed Austronesia as a whole, rather than spreading from Taiwan into other areas in steps or stages (Fig. 8). This model now has been contradicted by the archaeological evidence and by independent linguistic studies. Another iteration of the NMTCN Model was formulated by Solheim (2006: 90), most recently articulated as: The Nusantao began developing Pre-Austronesian as their trade language starting around 12,000 BP [years before present], forming over the vast territory from the east coast of Vietnam to the Bismarcks in northwestern Melanesia (Wallacea could be considered its homeland), and then Proto-Austronesian developed among the sailors and their families of the NMTCN in their communication and trading back again to the west through much of coastal eastern Indonesia and the Philippines, and along the coast of eastern Vietnam and South China. Many of the concepts of the NMTCN Model had emerged prior to the availability of highresolution archaeological data and other lines of evidence. For example, Solheim (e.g., 1964, 2006) stressed the links between Sa Huynh pottery in Vietnam and Kalanay pottery in the Philippines as evidence of a deeply ancient Nusantao sea-crossing network that would have excluded Taiwan from the origin story of Austronesians. Now these Sa Huynh-Kalanay pottery traditions are abundantly documented as post-dating 2500 years ago in Iron Age contexts (e.g., Reinecke et al. 2002; Hung et al. 2013), at least 1500 years more recent than the initial spread of a pottery-bearing horizon in ISEA (see below). While the NMTCN Model lacks direct supporting evidence, its proponents have sought support in two ways. First has been to question the validity of the historical linguistics conclusions of a Taiwan origin of the Austronesian languages that spread into other parts of ISEA, although so 11 far this conclusion has not been overturned. Second has been to question the dating of pottery-bearing horizons in different areas, although in fact the dating in Taiwan was much older than anywhere else in ISEA and then proceeded in discernable steps across the region. The Farming-language Dispersal Hypothesis and Out of Taiwan Model The Farming-language Dispersal Hypothesis and the Out of Taiwan Model have been linked together conceptually, but they should not be mistaken as a singular entity. Both are outlined here. According to the Farming-language Dispersal Hypothesis, many of the world’s major migrations occurred by farmers seeking new lands for their crops and livelihood, and the farming populations in most cases spoke unified languages (Bellwood and Renfrew 2002). In this view, land-dependent farming eventually would force some portion of a population to move into new territory. When people migrated, they brought their languages and other cultural traits with them, and they tended to move in multiple instances within short periods of time, resulting in archaeological records of apparently rapid geographic spreading. The Farming-language Dispersal Hypothesis in itself does not point to any specific migration route of the Austronesian-speaking groups who eventually spread through ISEA, but rather an independent line of evidence has come from linguistic studies that point to Austronesian language origins in Taiwan, hence building the framework for the Out of Taiwan Model (Fig. 9). According to the historical linguistic studies, the Austronesian languages are unified in a number of branches that reflect their order of separation and divergence form one another through time. When examining the inter-relationships of these branches in the Austronesian family, the oldest variants appear to be retained in Taiwan, and then a series of later branches can be mapped moving into various parts of ISEA and even later into the provinces of Pacific Oceania (Blust 2013). Conceptually, this hypothesis would require testing through the material archaeological inventories of ISEA to identify what traits could reflect 12 History and Current Debates of Archaeology in Island Southeast Asia, Fig. 8 Successive Austronesian language homelands and movements, suggested by Solheim and by Meacham. (Graphics source: Solheim 2006: 88, 91) History and Current Debates of Archaeology in Island Southeast Asia History and Current Debates of Archaeology in Island Southeast Asia, Fig. 9 The Out of Taiwan Model according to Bellwood. (Graphics source: Peter Bellwood, modified from Bellwood et al. 2011, Fig. 16.8) History and Current Debates of Archaeology in Island Southeast Asia 13 14 History and Current Debates of Archaeology in Island Southeast Asia History and Current Debates of Archaeology in Island Southeast Asia, Fig. 10 Examples of red slipped pottery, including a carinated jar with everted rim and an open footed bowl, from Nagsabaran Neolithic cultural layer, Cagayan, northern Luzon, Philippines. (Image source: Hsiao-chun Hung) the arrival of Austronesian-speaking groups and their geographic expansion across the region. Depending on the patterns that are found, they may or may not validate the linguistic outline of the Out of Taiwan Model. Those material inventories could be examined for signs of past farming or other food production, toward testing the Farming-language Dispersal Hypothesis. Bellwood (2005) recognized the potterybearing horizon as the most likely candidate to mirror past populations movements in ISEA. Looking at the cross-regional archaeological findings of ISEA, a sudden pottery-bearing horizon can be traced as moving generally from Taiwan well prior to 5000 years ago, then into different parts of ISEA after 4000 years ago and continuing for some centuries. This pottery trail reflected the geographic spread of cultural traits and ideas that logically involved the movement of people to certain degree. The geographic pattern accorded with the major steps in the linguistic history outline of the Out of Taiwan Model (Blust 2013). Bellwood further postulated that the Austronesian-speaking groups had migrated not only with pottery traditions but also with land-dependent farming systems or other forms of formal food-producing economies that forced people to seek new territories, in alignment with the Farming-language Dispersal Hypothesis. Current Evidence and Research Questions Now with more investigations throughout ISEA, as well as in neighboring areas of MSEA and East Asia, a more refined picture is emerging about the Two-layer Hypothesis. The older “first” layer of Australo-Melanesian hunter-gatherers now can be associated with flexed-burial traditions, and then the later “second” layer of East Asian sedentary groups now can be associated with extendedposition burial traditions. Additionally, this “second layer” included the Austronesian-speaking groups who derived from East Asian biological affinities, and many of the sites in Mainland China and Taiwan showed clear evidence of rice farming economy (e.g., Hung et al. 2017; Matsumura et al. 2018, in press). In terms of seeking how the apparent two population layers could match with a change in the archaeological record of ISEA, the association coincided mostly with the appearance of a pottery-bearing horizon at sites that furthermore have shown signs of sedentary lifestyle, beginning as early as 4000 years ago in some places of ISEA. Even later extensions of the pottery trail moved into Pacific Oceania after 3500 years ago (e.g., Hung 2005, 2008; Hung et al. 2011; Carson et al. 2013). So far, the cross-regional evidence of a pottery trail indicates at least three major steps in the large-scale picture of ancient population movements across ISEA. First, people in Taiwan had developed traditions of farming rice and millets, living in formal villages, and making varied pottery by 4800 years ago or perhaps earlier. Second, by 4000 years ago, related groups moved into the northern Philippines, bringing a sudden and distinctive pottery-bearing horizon with links to Taiwan at that time (Fig. 10), yet the composition History and Current Debates of Archaeology in Island Southeast Asia of food production has been unclear. Third, by 3500 years ago, the pottery-bearing horizon spread through more areas of ISEA. This pottery-bearing horizon often has been regarded as a Neolithic or New Stone Age association, overlaying and eventually replacing the older contexts of hunter-gatherer sites in the region. Those material traits appeared suddenly and then spread incrementally across the geographic expanse of ISEA, consistently replacing the older traditions of stone tool complexes. Furthermore, the new traditions of pottery, other artifacts, village layouts, and farming systems could be linked with the modern-day and historically known Austronesian-speaking groups of ISEA. Overall, the pottery-bearing horizon represented the geographic spread of people, materials, and ideas throughout ISEA, generally during the centuries following 4000 years ago. The archaeological records prove that people already had been living in the region for many thousands of years prior to that time, so logically some degree of population admixture must have occurred. In some exceptional cases, local indigenous populations may have continued entirely intact in a biological sense, simply adopting some of the technologies and lifeways associated with the new pottery-bearing contexts. In other extreme cases, people bringing pottery and additional traits may have completely replaced the pre-existing groups. The reality probably was more complicated and variable, but eventually the Austronesian languages came to be spoken all across the region with definite implications about actual population dynamics. If the Austronesian languages were so successful in spreading throughout the region, then other cultural traditions and probably the physical populations were involved as well to a significant degree. Given the strong congruence of the linguistic and archaeological findings (Bellwood et al. 2011), the Out of Taiwan Model appears to be robust and valid for describing the geographic spread of populations across ISEA. This descriptive evidence overall is consistent with the expectations of the Farming-language Dispersal Hypothesis, particularly for the starting point in eastern Taiwan where rice was cultivated in rather 15 limited land, dated to 4200 years ago (Deng et al. 2018). According to the Farming-language Dispersal Hypothesis, the population movements most likely were motivated by people seeking new lands for their food-producing land-use systems, but currently the direct evidence of farming has been inconsistent, and apparently the timing and composition differed across ISEA. Looking critically into these issues, the precise details of landuse systems must have been variable over the vast geography and time spans involved in the Austronesian diaspora. Rice farming eventually gained prominence in most areas of ISEA, but each of those earliest movements may have involved somewhat different motivations for the migrant groups, as well as somewhat different subsistence land-use patterns. Research into this topic has been ongoing (Carson and Hung 2018), and the findings have been varied in different sitespecific cases. This current understanding suggests a different scenario from a prior characterization of a rapid movement of people from Taiwan all the way eastward into Polynesia, as an Express Train Model (e.g., Diamond 1988). Recently, Simanjuntak (2017b) proposed an Eastern Route Migration (ERM) of Austronesian people who brought red-slipped pottery traditions from Taiwan into the Philippines, northern Borneo, Sulawesi, and Pacific Oceania, separate from a Western Route Migration (WRM) of Austroasiatic people who brought cord-marked pottery traditions from MSEA through Peninsular Malaysia and into Sumatra and Borneo (Fig. 11). While the red-slipped pottery horizon has been well documented and dated at several sites of ISEA reflecting a large-scale ERM, the situation has been considerably more complicated for a WRM at the western edge of ISEA, as there are pre-existing early hunter-gatherer communities of Australo-Melanesian affiliation (Matsumura et al. in press) lived along the western side of the South China sea coast (in southern China, coastal Vietnam, Thailand, and the Malaysian Peninsula) with pottery production at least as early as 7000–4000 years ago (Hung in press). Thus, the role of WRM will need future investigation for clarifying its relation with ancestral Austronesian groups. 16 History and Current Debates of Archaeology in Island Southeast Asia History and Current Debates of Archaeology in Island Southeast Asia, Fig. 11 The proposed two routes of Neolithic migrations, Austroasiatic and Austronesian, into Indonesia and the geographic distribution of sites with redslipped and cord-marked pottery. (Graphics source: Simanjuntak 2017b) Looking just at the pottery-bearing horizon as a prime indicator, ancient population dispersals occurred over the course of some centuries, and conceivably the contexts of population movements had changed through time. Some of the internal details have been arguable and subjected to ongoing investigations that continue to generate new factual datasets. At least four major research programs have targeted: (1) the dating and definition of different early pottery assemblages in coastal Mainland SEA (e.g., Peninsular Malaysia) and Sumatra, noting their relation with ancient Austronesian societies in the region; (2) the roles of domesticated animals (e.g., dogs, pigs, and chicken), especially in cases of their seacrossing translocation; (3) the emergence of farming or other formalized food-producing land-use systems in early ISEA; and (4) the ancient relationships between two or possibly more biological populations meeting in this region of ISEA. In summary, the linguistic evidence is essential for outlining the Out of Taiwan Model of Austronesian dispersals through ISEA, and archaeology offers a way to test this model and furthermore to clarify the dating and associated context of the individual steps in ancient population movements. So far, the weight of archaeological evidence currently supports the Out of Taiwan Model, with strong suggestions in favor of the Farming-language Dispersal Hypothesis as well as the Two-Layer Hypothesis. As mentioned, studies of both modern and ancient DNA consistently have confirmed the expectations of the Two-Layer Hypothesis and of the Out of Taiwan Model (e.g., McColl et al. 2018). The findings suggest a preexisting widespread Australo-Melanesian affinity throughout ISEA, later with increasing amounts of East Asian affinity in contexts of red-slipped pottery after 4000–3500 years ago. The East Asian affinities include definite links with Taiwan and coastal China as the deeper ancestral origin of the people who later spread throughout most of ISEA. No evidence at present can support the NMTCN Model. History and Current Debates of Archaeology in Island Southeast Asia While the Out of Taiwan Model may be regarded as portraying ancient population movements accurately, a number of core questions continue to drive regional research. The major focus for improving knowledge will be in developing and testing explanatory theories of the evident patterns and trends, such as proposed in the Farming-language Dispersal Hypothesis as a way to explain the evidence for the Out of Taiwan Model. In this regard, new lines of evidence will need to be brought into a comprehensive re-evaluation of the evidence, most likely looking at the new emerging findings in archaeo-botany and other specializations that still are in process of recovering primary datasets from relevant sites cross-regionally. Moreover, other hypothetical explanatory theories should be considered, although they would need to be logically consistent with the evidence in order to withstand testing with real data. International Perspectives Within the scope of what currently is known of ISEA archaeology, ample opportunities can be explored for solving questions and refining the available datasets. At present, the region-wide chronological narrative describes the early Homo erectus at 1.2–0.8 Ma, the first modern human more than 50,000 years ago, followed by the arrival and spread of rather large scale of human migrations, and then the Austronesian groups with a number of other changing conditions within the last 4000 years. The exact dating and the inventories of material findings have varied from one site to another, in total revealing crossregional patterns and chronological trends that have been essential for outlining the large-scale narratives of ancient migrations in different time intervals. The most enduring research themes in ISEA archaeology, such as the issues of the first arrival of Homo sapiens and the issues of Austronesian migrations, have been cross-regional and transcending political boundaries involving Taiwan, the Philippines, Malaysia, Indonesia, East Timor, and beyond. A cross-regional approach has characterized ISEA archaeology for several decades, 17 and this perspective continues to guide most research. The most enduring themes still relate to cross-regional questions, for example: 1. How many species of the Homo Genus have lived in ISEA? What were the relations between these Homo Genus and others outside ISEA? 2. How did different groups of the Homo Genus come to populate this broad and diverse region? 3. How, when, and why did ancient groups transition evidently from hunting-gathering to variable food-producing economies such as horticulture and farming? 4. How did the Austronesian language traditions develop into the historically known contexts of the region? 5. How did ISEA contribute to the formation of early Lapita cultural group in the Pacific Oceanic region? 6. How did ISEA begin its Metal Age (bronze and iron), historical kingdoms, and complex state polities? Within the established large-scale parameters of the archaeological record, these and other questions continue to be addressed with increasingly refined results. The work as a matter of practicality has proceeded one site at a time, and gradually the site-specific details have allowed re-assessment of the large-scale narratives. Future Directions Archaeology as a discipline in ISEA has undergone more than 100 years of development. A number of transformations occurred under foreign colonial and imperial influence, then again during and after World War II, and continuing more with professional advancements and training in each ISEA country. At present, numerous international collaboration projects are operating in ISEA for archaeology research. Through time, we can expect more projects by indigenous archaeologists, along with more research collaborations among countries within ISEA (or SEA more generally). 18 History and Current Debates of Archaeology in Island Southeast Asia In order to solve many research questions and debates, the need of linking data from multiple lines of evidence has been increasingly obvious. For example, several debates have continued about the Out of Taiwan Model, based on conflicting views of the archaeological findings in the western part of ISEA, such as in Borneo, in principle resolvable through clarifying the actual material evidence. Adding to these debates are long-standing disagreements about the concepts of Neolithic societies, the role of farming or other modes of subsistence economies, and the ability to examine pottery assemblages as cultural markers. Another factor in debates has been a healthy skepticism of grand narratives, effectively resisting them even without alternative evidence. Overall, the situation is beginning to be clarified through continual integration of archaeology with more lines of evidence from the advancing research in ancient genetics, archaeobotany, palaeo-landscape reconstructions, and other perspectives. Today, new discoveries from ISEA frequently attract the world’s attention, such as the recently reported “700,000-year-old stone tools point to mysterious human relative in Northern Luzon” (Ingicco et al. 2018), and “World’s oldest figurative painting discovered in Borneo cave” (Aubert et al. 2018). New discoveries continually change our knowledge about ISEA, and furthermore they revise our thoughts about the ancient world in general. As many parts of ISEA still are unexplored by modern-day archaeologists, ISEA will continue to support significant discoveries by new generations of investigators. 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