Assessing the impact of mid-to-late Holocene ENSO-driven climate change on toxic Macrozamia seed use: a 5000 year record from eastern Australia

Palaeoenvironmental and palaeoclimatic data indicate that during the mid-to-late Holocene eastern Australia became significantly drier and experienced more intense and more frequent droughts. These changes, driven by the re-emergence and intensification of the ENSO climate phenomena, have been argued to have had considerable impact on Aboriginal societies, although there is uncertainty as to the exact nature, timing and magnitude of this impact. This paper analyses changes in the utilisation of toxic Macrozamia (cycad) seeds at seven archaeological sites in eastern Australia, identifying an extremely close correlation between the intensity of seed use and two proxy ENSO datasets, and a weaker correlation with a third ENSO dataset. Given the ecological attributes and resource potential of these plants, it is argued that these correlations are best explained as an intensified exploitation of a lower-ranked resource in direct response to the increased subsistence risks and lower productivity created by ENSO-driven climatic conditions. It also suggests that by 3000 BP the intensification of the ENSO system was driving changes in human subsistence behaviour on a sufficient scale to have considerable impact on other aspects of the wider cultural systems.     

A caricature of Gramsci

Alastair Davidson: Antonio Gramsci: The Man, His Ideas, Australian Left Review Publications, Sydney, 1968, iv + 106 pp.     

Application of Quantitative Mineralogical Analysis in Archaeological Micromorphology: a Case Study from Barrow Is., Western Australia

This study assesses the use of the Tescan Integrated Mineral Analyser (TIMA) platform, which integrates scanning electron microscopy—energy dispersive spectroscopy (SEM-EDS) chemical analysis with mineral identification software, to quantitatively determine the mineralogical composition of sediments in archaeological research. Ten samples, spanning 50,000 years of sedimentation, were examined from archaeological excavation profiles in the Boodie Cave, Barrow Island, Western Australia. TIMA mineral abundance data show a gradual change from a polymineralogic quartz-rich assemblage from ~50–12 ka to a more simple carbonate-dominate assemblage from the terminal Pleistocene. This trend is consistent with a decreasing contribution of reworked terrestrial siliciclastic sediments derived from the mainland and an increase in carbonate sediments of marine derivation, as the exposed coastal plain become submerged during post-glacial sea-level rise. SEM-EDS analysis has also provided empirical data on cultural materials, mainly bone and shell fragments that similarly reflect the increasing contribution of marine fauna into the Holocene sediments. Particularly useful is the ability of mineral mapping function of the TIMA outputs to help distinguish 16 sub-units representing sections of the main nine stratigraphic units, including at least three contiguous midden events. The SEM-EDS data indicate that the redeposited sediments were derived from the overlying midden unit, with layering reflecting differential settling of mineral phases. This study demonstrates that automated mineralogy studies using TIMA can clearly aid the identification of provenance and processes within archaeological sediments and soils.     

Knopfelmacher's essays

Frank Knopfelmacher: Intellectuals and Politics, Nelson's Australian Paperbacks, Melbourne, 1968, vii + 156 pp., $2.95.     

Labour's Strategic Defence Review

Labour’s Strategic Defence Review claims to be ‘radical’, leading ‘to a fundamental reshaping of British forces’ while being ‘firmly ground in foreign policy’. Five questions are discussed: 1) Is labour’s defence policy different from that of its Conservative predecessors? 2) Has foreign policy ‘led’ defence policy? 3) How open was the review process and to what extent has Labour succeeded in creating a new consensus on defence policy? 4) Has the SDR successfully addressed the problem of overstretch? 5) Does it provide the ‘modern, effective and affordable armed forces which meet today’s challenges but are also flexible enough to adapt to change’, as it claims? This article argues that on the first two questions the answer is a qualified ‘yes’; that on the third, the process was more open than ever before but that it is difficult to identify specific decisions influence by more open debate; that on the fourth, Labour has attempted a balancing act which may be vulnerable, not least to changes in the economy; and that on the last question, Labour has succeeded in shifting the focus of the armed services towards power projection capabilities as required by their foreign policy baseline.