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The Late Cambrian to Early Ordovician sequence on the Denison Range, southwest Tasmania


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Corbett, KD 1975 , 'The Late Cambrian to Early Ordovician sequence on the Denison Range, southwest Tasmania' , Papers and Proceedings of the Royal Society of Tasmania, vol. 109 , pp. 111-120 .

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A well-exposed middle Late Cambrian to Early Ordovician clastic sequence, herein
referred to as the Denison Subgroup, unconformably overlies Middle Cambrian rocks on
the Denison Range and is conformably overlain by Ordovician limestone. Four formations
are recognized. The basal Singing Creek Formation (720 m) consists of interbedded
siltstone, quartzwacke turbidites, siliceous fine conglomerate, and slump sheets, and
contains an abundant Franconian trilobite-brachiopod fauna. It grades upwards into
the Great Dome Sandstone (510 m), a shallow marine-deltaic-fluvial sequence of crossbedded
quartz sandstone, siltstone and fine conglomerate, with a sparse fauna of
probable Late Cambrian age. Above this the Reeds Conglomerate (1560 m) comprises
largely non-marine pink siliceous conglomerate and cross-bedded sandstone, probably
deposited on alluvial fans. This grades into the marine Squirrel Creek Formation,
comprising a lower sandstone member (150 m) with worm burrows and gastropods, a siltstone-
limestone member (150 m) with an abundant Early Ordovician shelly fauna, and an
upper sandstone member (300 m).
The Denison Subgroup is approximately equivalent to the pre-limestone part of the
Junee Group in the 'original area of Lewis, and to the Owen Conglomerate of western

Item Type: Article
Authors/Creators:Corbett, KD
Keywords: Tasmania, Hobart, 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
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
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Copyright Royal Society of Tasmania

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