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Gordon Subgroup (Ordovician) carbonates at Precipitous Bluff and Point Cecil, southern Tasmania, Australia
Burrett, CF and Laurie, J and Stait, B (1981) Gordon Subgroup (Ordovician) carbonates at Precipitous Bluff and Point Cecil, southern Tasmania, Australia. Papers and Proceedings of the Royal Society of Tasmania, 115. pp. 93-99. ISSN 0080-4703
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The palaeogeographically and biostratigraphically important Ordovician carbonate
sequence at Precipitous Bluff is at least 360m thick. The lowest 130 m, the New River
Beds, consist of bryozoan algal biospararenites of Chazyan to Blackriveran age. These
beds were probably deposited in a high energy subtidal environment with minor periods of
intertidal deposition. The upper 50 m of this lowest unit contains abundant Calathium,
bryozoans and corals. The succeeding 230 m of biosparites, biomicrites, argillaceous
carbonates and siltstones, the Precipitous Bluff Beds, are dominated by trilobites,
brachiopods and bryozoans, range in age from Trentonian to Cincinnatian and were probably
deposited in deeper water than the New River Beds.
The Prion Beach Beds at Point Cecil, five km south of Precipitous Bluff, are
laceous micrites containing a trilobite/brachiopod fauna and include strata of Blackriveran
and rentonian age and are thus biostratigraphically correlated with the upper
part of the New River Beds and at least part of the Precipitous Bluff Beds.
Vertical carbonates along New River Lagoon and sheared carbonates at Point Cecil
suggest structural complications perhaps associated;with a continuation of a large,
possibly transcurrent fault, trending north along New River.
|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. 93-99|
|Collections:||Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania|
Copyright Royal Society of Tasmania
|Date Deposited:||28 May 2012 01:12|
|Last Modified:||18 Nov 2014 04:36|
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