RADIOCARBON DATES FOR BEESWAX FIGURES IN THE PREHISTORIC ROCK ART OF NORTHERN AUSTRALIA

Accelerator mass spectrometry radiocarbon ages have been taken for a test suite of small samples of material removed from some of the ‘beeswax’art figures found in rock shelters in northern Australia. The results indicate that we can reliably date this unique form of rock art with no noticeable damage. We had not expected to find figures of any great antiquity, and so we were surprised to find that the ages obtained spanned the time period from the recent past to about 4000 BP.     

OPTICAL DATING OF SINGLE AND MULTIPLE GRAINS OF QUARTZ FROM JINMIUM ROCK SHELTER,NORTHERN AUSTRALIA: PART I,EXPERIMENTAL DESIGN AND STATISTICAL MODELS*

Jinmium rock shelter is famous for the claims made by Fullagar et al. (1996) for the early human colonization and ancient rock art of northern Australia. These claims were based on thermo-luminescence ages obtained for the artefact-bearing quartz sediments that form the floor deposit at the site. In this paper, we outline the background to the optical dating programme at Jinmium, and describe the experimental design and statistical methods used to obtain optical ages from single grains of quartz sand. The results, interpretations, and implications of this dating programme are reported in a companion paper (Roberts et al. 7999, this volume).     

An Independent Confirmation of the 4 ka Antiquity of a Beeswax Figure in Western Arnhem Land,Northern Australia

Critical to any chronology is reliability in the determination of age for a distinctive artefact that is related to other components in a series. Therefore, the independent testing and verification of the antiquity of an apparent anomalous measurement for an old beeswax figure in northern Australia is of fundamental interest in rock art studies. Replication of the radiocarbon dating process has confirmed that one exceptional figure in early X‐ray style at the Gunbilngmurrung site in western Arnhem Land is indeed c. 4–4.5 ka. The result also confirms the great antiquity of paintings over which the beeswax was applied.     

The HMS Swift shipwreck: The development of underwater heritage protection in Argentina

Abstract

The aim of this article is to evaluate, with a critical perspective, the legal framework for heritage protection in Argentina, viewing it within an international context and focusing on the HMS Swift shipwreck – sunk in Puerto Deseado (Santa Cruz province) in 1770 – as a case study. Moreover, some initial proposals for a management plan are presented as a first step in thinking about the challenges of preserving underwater sites in Argentinian Patagonia.

Through this analysis some interesting points are outlined, including the reasons that make the Swift shipwreck a leading case in Argentina. It is the first interdisciplinary underwater archaeology project in the country comprising archaeologists who are also divers; it is supported by national authorities; and it is the first project of its kind to give underwater archaeologists experience in dealing with archaeological research and preservation in an environment of multiple conflicting interests.

The international relevance of the Swift case relies on the nature of underwater cultural heritage as an international resource. The project's history is located in an international setting, derived from ihternational trade and communication, in which many ships and their contents have been lost far from their origin or destination. At a national level the Swift is a wreck with significant historical and cultural value. It is in a unique state of preservation and its location near to the shore makes it highly accessible. Locally,HMS Swift will be relevant when Puerto Deseado's community starts to recognise it as a significant part of their own heritage and local people become involved in the preservation of the wreck.     

OPTICAL DATING OF SINGLE AND MULTIPLE GRAINS OF QUARTZ FROM JINMIUM ROCK SHELTER,NORTHERN AUSTRALIA: PART II,RESULTS AND IMPLICATIONS*

Quartz sediments from the floor deposit at Jinmium rock shelter have been investigated using the multiple-grain and single-grain optical dating methods described by Galbraith et al. (1999, this volume). Here we present the results of this dating programme and argue that the artefact-bearing sediments were deposited within the last 10000 years. This time interval is consistent with the radiocarbon chronology but is much younger than previous claims for initial human occupation during the Pleistocene. Analysis of individual grains revealed also that the characteristic saturation doses of some grains are unusually high, which may permit dating of deposits older than a few hundred thousand years. Such grain-to-grain differences raise doubts, however, about the validity of using multiple-grain samples to investigate the phenomenology of quartz luminescence.     

RIETVELD X-RAY DIFFRACTION AND X-RAY FLUORESCENCE ANALYSIS OF AUSTRALIAN ABORIGINAL OCHRES*

Rietveld phase analysis of X-ray powder diffraction patterns and chemical analysis by X-ray fluorescence spectroscopy have been used to characterize a series of red and yellow ochre samples from Aboriginal ochre deposits in South and Western Australia. The ochres were found to have diverse mineralogy, being mixtures of up to seven minerals, and also to have complex trace element signatures. The mineralogical characteristics and geochemistry of the ochres can be used to identify the source quarries. Using this combination of analytieal techniques it may be possible to trace the source of ochres in burial sites and on objects back to the original quarries.