Illuminating Southeast Asian Prehistory: New Archaeological and Paleoanthropological Frontiers for Luminescence Dating

Since the explorations of Alfred Russel Wallace and Eugene Dubois in the nineteenth century, Southeast Asia has been one of the world's focal points for studies of biogeography and biodiversity, human evolution and dispersal, environmental change, and the spread of culture, farming, and language. Yet despite its prominence, reliable chronologies are not available for many of the critical archaeological, evolutionary, and environmental turning points that have taken place in the region during the last 1.5 million years. In this paper, we discuss some of these chronological problems and describe how luminescence dating may help overcome them. "Luminescence dating" is a term that embraces the techniques of thermoluminescence (TL) and optical dating, which can be used to estimate the time elapsed since ubiquitous mineral grains, such as quartz and potassium feldspar, were last heated to a high temperature or were last exposed to sunlight. Luminescence methods have been successfully deployed at late Quaternary archaeological, paleoanthropological, and geological sites around the world, but not to any great extent in Southeast Asia. Here we describe the principles of TL and optical dating and some of the difficulties that are likely to arise in dating the volcanic minerals found throughout the region. We also outline several long-standing archaeological and paleoanthropological questions that are the subject of a current program of luminescence dating in Southeast Asia, and present recent dating results from Liang Bua in Indonesia and Bukit Bunuh in Malaysia. KEYWORDS: luminescence dating, archaeology, paleoanthropology, Quaternary, Southeast Asia, Liang Bua, Bukit Bunuh

Establishing the time of initial human occupation of Liang Bua, western Flores, Indonesia

Liang Bua, a limestone cave in western Flores, has an archaeological and faunal sequence known to span the last 95 ka and is the type-site for a small-bodied hominid species, Homo floresiensis. This paper describes the geomorphic history of this significant site, and presents numerical ages for key events as determined by thermo luminescence dating of sediments (using a dual-aliquot regenerative-dose protocol) and uranium-series dating of flowstones. Our age estimates indicate that Liang Bua existed as a subterranean chamber by 400 ka ago. It was subsequently exposed by the incision of the Wae Racang River, which invaded the cave around 190 ka and deposited an upward-fining sequence of water-rolled boulders and cobbles. The latter conglomerate was partially reworked around 130 ka ago and was capped by flowstones at 100 ka. The conglomerate also contains stone artefacts, which implies that the occupation of the surrounding area is at least as old as the time of emplacement of the conglomerate. After 190 ka, a complex sequence of erosion and deposition led to the accumulation of at least 11 m of sediment in the front chamber of the cave, which proved suitable for hominid occupation. Such geochronological and geomorphological information is extremely valuable for interpreting the archaeological record at Liang Bua and its wider significance. (c) 2006 Elsevier Ltd. All rights reserved

Causes of extinction of vertebrates during the Holocene of mainland Australia: arrival of the dingo, or human impact?

The arrival of the dingo in mainland Australia is believed to have caused the extinction of three native vertebrates: the thylacine, the Tasmanian devil and the Tasmanian native hen. The dingo is implicated in these extinctions because, while these three species disappeared during the late Holocene of mainland Australia in the presence of the dingo, they persisted in Tasmania in its absence. Moreover, the dingo might plausibly have competed with the thylacine and devil, and preyed on the native hen. However, another variable is similarly correlated with these extinctions: there is evidence for an increase in the human population on the mainland that gathered pace about 4000 years ago and was associated with innovations in hunting technology and more intensive use of resources. These changes may have combined to put increased hunting pressure on large vertebrates, and to reduce population size of many species that were hunted by people on the mainland. We suggest that these changes, which were quite dramatic on mainland Australia but were muted or absent in Tasmania, could have led to the mainland extinctions of the thylacine, devil and hen

Vietnam's socio-economic development : a social science review

The small-bodied hominin Homo jloresiensis was recently identified at Liang Bua, Flores, Indonesia. Some researchers have argued that H. jloresiensis represents pathological individuals from a behaviorally modern Homo sapiens population, arguing in part that the stone-tools found in association are too advanced to have been manufactured by a nonmodern hominin. Here we show that the Pleistocene stone-tools from Flores, including Liang Bua, are technologically and morphologically similar to the 1.2-1.9 Mya OldowaniDeveloped Oldowan tools from Olduvai Gorge in Africa. The Pleistocene lithic technology on Flores was therefore within the capabilities of small-brained, nonmodern hominins

Beeswax rock art from Limmen National Park (Northern Territory), northern Australia: new insights into technique-based patterning and absence in the rock art record

The known geographic distribution of beeswax rock art is largely restricted to the Arnhem Land plateau and Kimberley regions of northern Australia. While considerable research has focussed on the antiquity and meaning of beeswax rock art, much less attention has been directed to the nature and extent of the distribution pattern for this unique motif production technique. In this article, we present details of two beeswax motifs recently discovered in Marra Country at Limmen National Park (southwest Gulf of Carpentaria, Northern Territory). In the first instance, the motifs are explored in the context of their meaning, drawing on ethnography collected in the region over the last 40 years. The motifs are then used as a platform to engage with questions around the low frequency, and in some cases complete absence, of beeswax rock art across other areas of northern Australia. While it is highly unlikely there is one single, homogenous explanation for this in the Gulf country and northeastern Australia, we suggest that exploring the social, cultural and relational understandings of beeswax in these areas offers considerable potential to understand better how people engaged with and inscribed their cultural landscapes

Age and context of the oldest known hominin fossils from Flores

Recent excavations at the early Middle Pleistocene site of Mata Menge in the So'a Basin of central Flores, Indonesia, have yielded hominin fossils attributed to a population ancestral to Late Pleistocene Homo floresiensis. Here we describe the age and context of the Mata Menge hominin specimens and associated archaeological findings. The fluvial sandstone layer from which the in situ fossils were excavated in 2014 was deposited in a small valley stream around 700 thousand years ago, as indicated by 40Ar/39 Ar and fission track dates on stratigraphically bracketing volcanic ash and pyroclastic density current deposits, in combination with coupled uranium-series and electron spin resonance dating of fossil teeth. Palaeoenvironmental data indicate a relatively dry climate in the So'a Basin during the early Middle Pleistocene, while various lines of evidence suggest the hominins inhabited a savannah-like open grassland habitat with a wetland component. The hominin fossils occur alongside the remains of an insular fauna and a simple stone technology that is markedly similar to that associated with Late Pleistocene H. floresiensis