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A late Middle Cambrian shallow-water trilobite fauna from the Mt Read Volcanics, northwestern Tasmania
Jago, JB and McNeill, AW (1997) A late Middle Cambrian shallow-water trilobite fauna from the Mt Read Volcanics, northwestern Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 131. pp. 85-90. ISSN 0080-4703
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Near Middlesex Road, 9 km northeast of the Hellyer mine, northwestern Tasmania, a mineral exploration hole intersects a polymict volcaniclastic conglomerate of the Southwell Subgroup of the Mt Read Volcanics. At depths of 353 m and 364 m, fossiliferous limestone clasts within this conglomerate contain trilobites, including an unassigned agnostoid cephalon, Amphoton sp., Liopeishania sp., Menocephalites(?) sp., Lisania(?) sp. and an unassigned member of the Dorypygidae, thus suggesting an age of Goniagnostus nathorsti Zone to early Lejopyge laevigata Zone (i.e. Late Middle Cambrian) range. This shallow-water fauna is unusual for the Tasmanian Cambrian, in which most faunas are found in deeper water shales and siltstones. The horizon from which the fossils come is stratigraphically dose to a rhyolite with a SHRIMP zircon age of 503.2 ± 3.8 Ma; the usefulness of this figure in terms of the Cambrian time-scale is questioned.
|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. 85-90|
|Additional Information:||Copyright Royal Society of Tasmania|
|Date Deposited:||22 May 2012 03:55|
|Last Modified:||18 Nov 2014 04:33|
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