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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Boundaries and Correlations
Late Silurian-Early Devonian relationships in the central Victorian and western Tasmanian clastic sequences, Australia
Abstract
The relationship of early Devonian graptolite occurrences to shelly faunas in the central Victorian province is briefly reviewed. Recently published interpretations of the stratigraphical correlation within this province, and with European type sections, are based essentially on the inferred stratigraphic relationship of early Devonian pelagic faunas (graptolites and tentaculites) to benthonic shelly fossil sequences. Two factors in combination have lead to an erroneous scheme of stratigraphical correlation and faunal succession. These are:-
1) Lack of recognition of the upper range of the trilobite Encrinurus in the benthonic sequences, and lack of recognition of the significance of the youngest fauna in which it occurs.
2) Lack of recognition of a regional unconformity beneath the Coopers Creek Formation at the base of the Walhalla Group.
A scheme of stratigraphical correlation is proposed which brings together all existing data, and which, in turn, is in harmony with a stratigraphical correlation of Lower Devonian limestone sequences of eastern Australian based on conodont evidence. Biostratigraphic criteria for the recognition of the Silurian-Devonian boundary (here taken as the base of the Gedinnian) in eastern Australia are reviewed. A correlation of the Heathcote succession with the Eldon Group of western Tasmania is established.
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