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Late Quaternary fan gravels and slope deposits at Rocky Cape, northwestern Tasmania: their palaeoenvironmental significance

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Colhoun, EA (1977) Late Quaternary fan gravels and slope deposits at Rocky Cape, northwestern Tasmania: their palaeoenvironmental significance. Papers and Proceedings of the Royal Society of Tasmania, 111. pp. 13-27. ISSN 0080-4703

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Abstract

The paper describes a sequence of stratified quartzite slope deposits and
alluvial fan gravels from a small catchment at Rocky Cape.
A lower series of indurated slope deposits overlain by a podzol soil profile
suggests that cold climatic conditions, which favoured frost fracturing of exposed
13
rock surfaces and gelifluction of detritus, occurred prior to the Last Glacial Stage.
An upper series of unconsolidated slope deposits contains wedge structures. These
deposits appear to have resulted from frost fracturing and to have been moved downslope
by gelifluction processes. The wedge structures may have been produced by seasonal
freezing of the ground surface during the period of maximum cold in the Last Glacial
Stage (after 22,000 and before 10,000 BP).
Radiocarbon dating of charcoal and wood from organic horizons and a buried soil
in the lower part of a thick sequence of alluvial fan gravels shows that they began
to accumulate mainly between about 33,000 and 22,000 BP, when strong but episodic
erosion of the open Eucalyptus forested catchment occurred. The upper part of the
alluvial fan gravels does not contain organic horizons but probably accumulated after
22,000 and before 10,000 BP. The gravels were largely derived from the upper series
of slope deposits which were formed in a non-forested environment.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 13-27
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 28 May 2012 03:54
Last Modified: 18 Nov 2014 04:37
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