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Extent of the Late Cainozoic periglacial domain in southwest Tasmania, Australia.


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Kiernan, K 2008 , 'Extent of the Late Cainozoic periglacial domain in southwest Tasmania, Australia.' , Zeitschrift fur Geomorphologie, vol. 52, no. 3 , pp. 325-348 , doi: 10.1127/0372-8854/2008/0052-0325.

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Examination of colluvium mantles and associated alluvial fans along a low altitude
transect extending 65 km through western and south-western Tasmania indicates there to
have heen negligible development of these features inside the ice limits attained during the most
recent glacier advance, but that progressively thicker accumulations occur inside successively
older glacial limits. This juxtaposition of moraines and slope mantles suggests that most slope
instability occurred during episodes of cold climate in response to periglacial processes. The
origin of some of the oldest glacigenic sediment has been masked almost entirely by this
periglacial reworking. Angular rock rubble is abundant in extraglacial slope deposits and
attests to vigorous mechanical weathering of bedrock that is not occurring under the present
climate. Similar rock rubble in the entrances to some extraglacial karst caves is not explicable
by fire-induced bedrock spalling, gypsum wedging, salt weathering or hydration shattering,
and it is interpreted as the product of periglacial frost action. Two such cave rubble accumulations
dated to MIS 2 indicate that frost action processes were effective to as low as 40 m altitude.

Item Type: Article
Authors/Creators:Kiernan, K
Journal or Publication Title: Zeitschrift fur Geomorphologie
ISSN: 0372-8854
DOI / ID Number: 10.1127/0372-8854/2008/0052-0325
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