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The significance and provenance of stromatolitic clasts in a probable Late Precambrian diamictite in north-western Tasmania
Griffin, BJ and Preiss, WW (1976) The significance and provenance of stromatolitic clasts in a probable Late Precambrian diamictite in north-western Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 110. pp. 111-127. ISSN 0080-4703
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Two types of stromatolitic dolomite boulders occur in a diamictite of possibly
late Precambrian age in northwestern Tasmania; they are the oldest Tasmanian fossils
so far recorded. The first type comprises dark grey dolomites containing the stromatolite
Baicalia cf. B. burra, generally well preserved. The remainder are pale
grey rather recrystallised dolomites containing stratiform and columnar-layered stromatolites.
Their diagenesis and intrusion by dolomite veins preceded the erosion and
redeposition of the clasts into the diamictite.
The diamictite contains no diagnostic evidence of glaciation though a glacial
origin cannot be definitely excluded. A debris flow mechanism of deposition is
There is no proof in the material examined that either the well preserved
Baicalia specimens or the recrystallised stromatolitic dolomites, occurring in clasts
in the diamictite, were derived from the Smithton Dolomite. The occurrence of
Baicalia cf. B. burra is consistent with a late Precambrian age of the source rocks,
and close comparisons can be made with the Skillogalee Dolomite of South Australia.
|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. 111-127|
|Collections:||Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania|
Copyright Royal Society of Tasmania
|Date Deposited:||28 May 2012 04:19|
|Last Modified:||18 Nov 2014 04:37|
|Item Statistics:||View statistics for this item|
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