Ben Marwick

Human occupation of northern Australia by 65,000 years ago

The time of arrival of people in Australia is an unresolved question. It is relevant to debates about when modern humans first dispersed out of Africa and when their descendants incorporated genetic material from Neanderthals, Denisovans and possibly other hominins. Humans have also been implicated in the extinction of Australia’s megafauna. Here we report the results of new excavations conducted at Madjedbebe, a rock shelter in northern Australia. Artefacts in primary depositional context are concentrated in three dense bands, with the stratigraphic integrity of the deposit demonstrated by artefact refits and by optical dating and other analyses of the sediments. Human occupation began around 65,000 years ago, with a distinctive stone tool assemblage including grinding stones, ground ochres, reflective additives and ground-edge hatchet heads. This evidence sets a new minimum age for the arrival of humans in Australia, the dispersal of modern humans out of Africa, and the subsequent interactions of modern humans with Neanderthals and Denisovans.

Pleistocene Exchange Networks as Evidence for the Evolution of Language

Distances of raw material transportation reflect how hominid groups gather and exchange information. Early hominids moved raw materials short distances, suggesting a home range size, social complexity and communication system similar to primates in equivalent environments. After about 1.0 million years ago there was a large increase in raw material transfer distances, possibly a result of the emergence of the ability to pool information by using a protolanguage. Another increase in raw material transfer occurred during the late Middle Stone Age in Africa (after about 130,000 years ago), suggesting the operation of exchange networks. Exchange networks require a communication system with syntax, the use of symbols in social contexts and the ability to express displacement, which are the features of human language. Taking the Neanderthals as a case study, biological evidence and the results of computer simulations of the evolution of language, I argue for a gradual rather than catastrophic emergence of language coinciding with the first evidence of exchange networks.

Computational Reproducibility in Archaeological Research: Basic Principles and a Case Study of Their Implementation

The use of computers and complex software is pervasive in archaeology, yet their role in the analytical pipeline is rarely exposed for other researchers to inspect or reuse. This limits the progress of archaeology because researchers cannot easily reproduce each other’s work to verify or extend it. Four general principles of reproducible research that have emerged in other fields are presented. An archaeological case study is described that shows how each principle can be implemented using freely available software. The costs and benefits of implementing reproducible research are assessed. The primary benefit, of sharing data in particular, is increased impact via an increased number of citations. The primary cost is the additional time required to enhance reproducibility, although the exact amount is difficult to quantify.

Toward standard practices for sharing computer code and programs in neuroscience

Computational techniques are central in many areas of neuroscience and are relatively easy to share. This paper describes why computer programs underlying scientific publications should be shared and lists simple steps for sharing. Together with ongoing efforts in data sharing, this should aid reproducibility of research.

Late Holocene climate change and human behavioural variability in the coastal wet-dry tropics of northern Australia: Evidence from a pilot study of oxygen isotopes in marine bivalve shells from archaeological sites

Abstract Previously it has been argued that midden analysis from three geographically distinct coastal regions of tropical northern Australia (Hope Inlet, Blyth River, Blue Mud Bay) demonstrates that changes through time in Aboriginal mollusc exploitation reflect broader coastal environmental transformations associated with late Holocene climatic variability (Bourke et al. 2007). It was suggested that, while a direct link between environmental change and significant cultural change in the archaeological record has yet to be demonstrated unambiguously, midden analysis has the potential to provide the as-yet missing link between changes in climate, environment and human responses over past millennia. We test this hypothesis with a preliminary sclerochronological analysis (i.e. of sequential stable isotopes of oxygen) of archaeological shell samples from all three regions. Our findings suggest the existence of variations in temperature and rainfall indicative of an increasing trend to aridity from 2000 to 500 cal. BP, consistent with previous palaeoenvironmental work across northern Australia.

Self-image, the long view and archaeological engagement with film: an animated case study

Abstract Academic engagement with popular constructions of archaeology in film is often in the style of analysing the self-image of archaeologists and archaeology. Two distinctive types of this narcissistic approach are identified in the current literature: a negative and defensive approach and a positive and forgiving approach. Both of these approaches have yielded substantial insights about the public perception of archaeology and will undoubtedly continue to be fruitful avenues of inquiry. In this paper a third mode of engagement is outlined that is motivated by the unique ability of archaeology to provide a long-term view on things that matter to us now. The 2008 Pixar film Wall-E is used as a case study to show how this long-term view can relate to films that are not directly about archaeology. The case study of Wall-E shows that a counter-narcissistic approach can be an insightful and non-judgmental method of media analysis by decoding the popular appeal of an artwork and revealing new opportunities for archaeology to engage more productively with the film-watching public.

Packaging data analytical work reproducibly using R (and friends)

ABSTRACT Computers are a central tool in the research process, enabling complex and large-scale data analysis. As computer-based research has increased in complexity, so have the challenges of ensuring that this research is reproducible. To address this challenge, we review the concept of the research compendium as a solution for providing a standard and easily recognizable way for organizing the digital materials of a research project to enable other researchers to inspect, reproduce, and extend the research. We investigate how the structure and tooling of software packages of the R programming language are being used to produce research compendia in a variety of disciplines. We also describe how software engineering tools and services are being used by researchers to streamline working with research compendia. Using real-world examples, we show how researchers can improve the reproducibility of their work using research compendia based on R packages and related tools.

Palaeoecology and Forager Subsistence Strategies during the Pleistocene – Holocene Transition: A Reinvestigation of the Zooarchaeological Assemblage from Spirit Cave, Mae Hong Son Province, Thailand

abstract: This reanalysis uses the zooarchaeological assemblage recovered from Spirit Cave to understand hunter-gatherer use and occupation at the site during the Pleistocene – Holocene transition. We analyze bone fragmentation, sample size, and relative abundance to establish the preservation and overall composition of the remaining fauna. Identification of several new taxa, including roundleaf bats (Hipposideros larvatus and bicolor), elongated tortoise (Indotestudo elongata), black marsh turtle (Siebenrockiella crassicollis), Burmese hare (Lepus cf. peguensis) and a potential red junglefowl (Phasianidae — ?Gallus gallus) provide insights into hunter-gatherer occupation, palaeoecology, and subsistence strategies between 12,000 and 7000 years b.p. Our results indicate that Spirit Cave was occupied more sporadically than originally suggested; additionally, we identify new evidence for landscape disturbance during the early Holocene. Although this Spirit Cave zooarchaeological assemblage is incomplete, it remains an important component of Southeast Asian prehistory, providing evidence for human adaptations during a period of climatic change and instability.

Discovery of emergent issues and controversies in anthropology using text mining, topic modeling, and social network analysis of microblog content

R is a convenient tool for analyzing text content to discover emergent issues and controversies in diverse corpora. In this case study, I investigate the use of Twitter at a major conference of professional and academic anthropologists. Using R I identify the demographics of the community, the structure of the community of Twitter-using anthropologists, and the topics that dominate the Twitter messages. I describe a series of statistical methods for handling a large corpus of Twitter messages that might otherwise be impractical to analyze. A key finding is that the transformative effect of Twitter in academia is to easily enable the spontaneous formation of information-sharing communities bound by an interest in an event or topic.

The Walandawe tradition from Southeast Sulawesi and osseous artifact traditions in island Southeast Asia

This chapter describes a sample of points and other osseous artifacts recovered from Holocene contexts at three sites in Walandawe, Southeast Sulawesi, Indonesia. Microscopic observations of use traces and manufacturing techniques are presented as well as metrical observations and morphological classifications. The points show a suite of temporal trends apparently related to a shift from a predominant use as hafted projectile points to their growing use as penetrative tools. Trends include a higher incidence of wear and decline in tip damage, a decrease in bipoint production, an increased focus on unipoints, and a manufacturing shift from predominantly scraping cortical bone to frequently grinding suid incisors and long-bone shafts. Notwithstanding these changes, the Walandawe osseous artifacts constitute an identifiable tradition with systematic differences from other Island Southeast Asian assemblages located in southwest Sulawesi and especially Borneo, the Aru Islands, the northern Moluccas and the New Guinea Bird’s Head.