posted on 2023-11-02, 04:43authored byCJ Maclean, EA Bowen
A conformable succession in Palaeozoic rocks occurs at the Davey River at the southern end of the Olga-Hardwood syncline in S.W. Tasmania, and consists of the following formations (with approximate thicknesses): (top) Unit 6 Sandstone 10 metres Unit 5 Shale 15 metres Unit 4 Sandstone, minor shale, conglomerate 75 metres Unit 3 Shale-sandstone alternation 0-500 metres Unit 2 Pebbly sandstone 0-500 metres (bottom) Unit 1 Quartzite conglomerate 0-800 metres Formations 1, 2 and 3 are equivalent, on lithological and structural grounds, to the Bathurst Harbour Sequence of Jennings (1961). Unit 4 has lithological and faunal similarities with the Caroline Creek Sandstone of the West Coast Ordovician succession (Banks 1962b). Equivalents of the Florentine Valley Mudstone and Gordon Limestone are probably also present in the centre of the syncline, If these correlations arc correct the Davey River succession provides a link between the Bathurst Harbour and West Coast successions, with the Long Bay Shale representing a marine formation which is present in the South-west but apparently absent on the West Coast.
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Papers & Proceedings of the Royal Society of Tasmania