Marc Oxenham

The first settlement of Remote Oceania: the Philippines to the Marianas

The authors compare pottery assemblages in the Marianas and the Philippines to claim endorsement for a first human expansion into the open Pacific around 1500 BC. The Marianas are separated from the Philippines by 2300km of open sea, so they are proposing an epic pioneering voyage of men and women, with presumably some cultivated plants but apparently no animals. How did they manage this unprecedented journey?

Optimal Ancient DNA Yields from the Inner Ear Part of the Human Petrous Bone

The invention and development of next or second generation sequencing methods has resulted in a dramatic transformation of ancient DNA research and allowed shotgun sequencing of entire genomes from fossil specimens. However, although there are exceptions, most fossil specimens contain only low (~ 1% or less) percentages of endogenous DNA. The only skeletal element for which a systematically higher endogenous DNA content compared to other skeletal elements has been shown is the petrous part of the temporal bone. In this study we investigate whether (a) different parts of the petrous bone of archaeological human specimens give different percentages of endogenous DNA yields, (b) there are significant differences in average DNA read lengths, damage patterns and total DNA concentration, and (c) it is possible to obtain endogenous ancient DNA from petrous bones from hot environments. We carried out intra-petrous comparisons for ten petrous bones from specimens from Holocene archaeological contexts across Eurasia dated between 10,000-1,800 calibrated years before present (cal. BP). We obtained shotgun DNA sequences from three distinct areas within the petrous: a spongy part of trabecular bone (part A), the dense part of cortical bone encircling the osseous inner ear, or otic capsule (part B), and the dense part within the otic capsule (part C). Our results confirm that dense bone parts of the petrous bone can provide high endogenous aDNA yields and indicate that endogenous DNA fractions for part C can exceed those obtained for part B by up to 65-fold and those from part A by up to 177-fold, while total endogenous DNA concentrations are up to 126-fold and 109-fold higher for these comparisons. Our results also show that while endogenous yields from part C were lower than 1% for samples from hot (both arid and humid) parts, the DNA damage patterns indicate that at least some of the reads originate from ancient DNA molecules, potentially enabling ancient DNA analyses of samples from hot regions that are otherwise not amenable to ancient DNA analyses.

The expansions of farming societies and the role of the Neolithic Demographic Transition

The hypothesis of the Neolithic demographic transition (NDT) postulates that sharp increases in birthrates occurred as populations in different parts of the world adopted sedentary lifestyles and food storage, reduced their birth intervals, and came to depend increasingly on food production as opposed to foraging. For a period after these regional transitions to food production occurred, birth rates and absolute population numbers increased dramatically, at least in those areas (Europe, Middle East, North Africa, North America, Southeast Asia) so far subjected to cemetery analysis. This chapter discusses some general issues connected with early farmer expansion and presents archaeological and cemetery data relevant for an evaluation of the NDT hypothesis from East and Southeast Asia.

Demographic transitions and migration in prehistoric East/Southeast Asia through the lens of nonmetric dental traits

The aim of this study is to examine and assess the nonmetric dental trait evidence for the population history of East and Southeast Asia and, more specifically, to test the two-layer hypothesis for the peopling of Southeast Asia. Using a battery of 21 nonmetric dental traits we examine 7,247 individuals representing 58 samples drawn from East and Southeast Asian populations inhabiting the region from the late Pleistocene, through the Neolithic, Bronze Age, Iron Age, and into the historic and modern periods. The chief data reduction technique is a neighbor-joining tree generated from the triangular matrix of mean measure of divergence values. Principal findings indicated a major dichotomization of the dataset into (1) an early Southeast Asian sample with close affinities to modern Australian and Melanesian populations and (2) a very distinct grouping of ancient and modern Northeast Asians. Distinct patterns of clinal variation among Neolithic and post-Neolithic Mainland Southeast Asian samples suggest a center to periphery spread of genes into the region from Northeast Asia. This pattern is consistent with archaeological and linguistic evidence for demic diffusion that accompanied agriculturally driven population expansion in the Neolithic. Later Metal Age affinities between Island and Mainland coastal populations with Northeast Asian series is likely a consequence of a South China Sea interaction sphere operating from at least 500 BCE, if not from the Neolithic. Such results provide extensive support for the two-layer hypothesis to account for the population history of the region.

Biological Responses to Change in Prehistoric Viet Nam

A bioarchaeological analysis of human remains from Con Co Ngua, a Da But culture period cemetery site in northern Viet Nam (n = 96), and an aggregated sample from 11 sites, mostly from the Red River delta region (n = 96) representing the emerging Metal period in the same region, is carried out. This study focuses on a range of skeletal and dental signatures of both health and behavior, including carious lesions, antemortem tooth loss, alveolar defects of pulpal origin, dental task wear facets, cribra orbitalia, linear enamel hypoplasia, trauma, and chronic infectious disease. The findings of reasonably good oral health may be reflective of a lack of agricultural products in the diet and/or the low cariogenicity of rice. The physiological health of the samples was found to be compromised, with an elevated mortality among younger individuals that expressed evidence of physiological disturbance as measured by cribra orbitalia and/or linear enamel hypoplasia. The nature and frequency of trauma in both periods was not necessarily indicative of specific behaviors, with general misadventure and interpersonal violence as competing causes. The evidence for chronic infectious disease is apparent only in the Metal period and may be related to a range of factors, some of which include the effects of migration, changes to land use patterns, and/or the evolution of increased pathogen virulence.

An Son and the Neolithic of Southern Vietnam

Between 4500 and 3500 years ago, partially intrusive Neolithic populations in the riverine basins of mainland Southeast Asia began to form mounded settlements and to develop economies based on rice cultivation, fishing, hunting, and the domestication of animals, especially pigs and dogs. A number of these sites have been excavated in recent years and they are often large mounds that can attain several meters in depth, comprising successive layers of alluvial soil brought in periodically to serve as living floors. The site of An Son is of this type and lies in a small valley immediately north of the Mekong Delta in southern Vietnam. Excavated on five occasions since 1978, and most recently in 2009, it was occupied from the late third into the late second millennium b.c. An Son has produced evidence that attests the domestication of pigs and dogs in all layers apart (perhaps) from the most basal one, which was not investigated in 2009, together with the growing of rice of the subspecies Oryza sativa japonica, of Chinese Neolithic origin. The oldest pottery has simple incised and punctate zoned decoration with parallels in central Thailand, especially in the basal phases at Nong Nor and Khok Phanom Di. From its middle and later occupation phases (1800–1200 b.c.), An Son has produced a number of supine extended burials with finely decorated pottery grave goods that carry some unique forms, especially vessels with wavy or serrated rims. The An Son burials represent a Neolithic population that expressed a mixture of both indigenous Hoabinhian and more northerly (probably Neolithic southern Chinese) cranial and dental phenotypes, perhaps representing a likely ancestral population for some of the modern Austroasiatic-speaking populations of mainland Southeast Asia.

Health and the experience of childhood in late Neolithic Viet Nam

The article aims to examine aspects of mortuary behavior in late Neolithic/early Bronze Age (Phung Nguyen phase) populations represented at the site of Man Bac in Viet Nam, specifically how mortuary behavior illuminates the role of children, and adult attitudes toward children. In addition, the authors discuss biological characteristics of the human sample, focusing particularly on the child burials, in order to explore aspects of childhood palaeohealth. The methodology includes combining various measures of health—including palaeodemography (childhood mortality), analysis of oral health (Early Childhood Caries or ECC), and analysis of physiological health (Cribra Orbitalia and LEH)—with studies of culturally defined mortuary practices to suggest that, while children clearly had significant health deficiencies and many suffered early deaths, their treatment in mortuary rites shows significant economic value and social esteem placed on children.

The Neolithic Demographic Transition and Oral Health: The Southeast Asian Experience

The purpose of this article is to present new oral health data from Neolithic An Son, southern Vietnam, in the context of (1) a reassessment of published data on other Neolithic, Bronze, and Iron Age Southeast Asian dental series, and (2) predictions of the Neolithic Demographic Transition (NDT). To this end, frequencies for three oral conditions (caries, antemortem tooth loss, and alveolar lesions) were investigated for seven Southeast Asian adult dental series from Thailand and Vietnam with respect to time period, age-at-death and sex. A clear pattern of elevated rates for oral disease in the Neolithic followed by a marked improvement in oral health during the Bronze and Iron Ages was observed. Moreover, rates of caries and antemortem tooth loss for females were almost without exception higher than that for males in all samples. The consensus view among Southeast Asian bioarchaeologists that oral health did not decline with the adoption/intensification of agriculture in Southeast Asia, can no longer be supported. In light of evidence for (1) the low cariogenicity of rice; (2) the physiological predisposition of females (particularly when pregnant) to poorer oral health; and (3) health predictions of the NDT model with respect to elevated levels of fertility, the most plausible chief explanation for the observed patterns in oral health in Southeast Asia is increased levels of fertility during the Neolithic, followed by a decline in fertility during the subsequent Bronze and Iron Ages.

Modeling time-since-death in Australian temperate conditions

Studies of time-since-death (TSD) with respect to decomposition processes have been limited in scope. Most research has focused on qualitative descriptions of decomposition, which are too broad to be of use in recent death investigations. This study developed a degree of decomposition index (DDI) by quantifying stages of decomposition for individual body elements. Two Sus scrofa (White hybrid pigs) were allowed to decompose undisturbed on the ground surface, one in full sun and the other in semi-shade, between November 2006 and January 2007 in the Canberra region, Australia. The results of the regression modelling suggests that TSD accounts for the majority of variation in decomposition (using the DDI), while variations in macro-environment (sun versus shade) were not significant contributing factors. It is concluded that quantifying decomposition is an effective method of estimating TSD, which negates variable environmental effects on the decomposition process. The implications for forensic investigations of recent deaths include the potential to provide an improved estimation of TSD at the time of body recovery. There are also important implications for future research into decomposition and for forensic anthropology in general.

Emergence and Diversification of the Neolithic in Southern Vietnam: Insights From Coastal Rach Nui

ABSTRACT We examine the southern Vietnamese site of Rach Nui, dated to between 3390 and 3850 cal BP, in the context of three major aspects of the Neolithic in Mainland Southeast Asia: mound formation and chronology, construction techniques, and subsistence economy. Results indicate that this ca. 75 m in diameter, 5 m high mound, comprising over a dozen phases of earthen platforms, upon which were raised sophisticated wooden structures, was built in <200 years. While consuming domesticated millet, rice, and occasionally dogs and pigs, the main subsistence orientation included managed tubers and fruits and a range of mangrove ecosystem taxa: catfishes, turtles, crocodiles, monitor lizards, macaques and langurs, to name a few. This combined vegeculture-foraging lifeway in a mangrove forested environment, likely in the context of a tradable goods extractive industry, adds to a growing picture of significant diversity, and sophisticated construction skills in the Southeast Asian Neolithic.