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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Stratigraphy of Special Areas
Lower and Middle Devonian of the Molong Geanticline, New South Wales, Australia
Abstract
During much of its development in the southern half of New South Wales, the Tasman geosyncline was divided by a ridge known as the Molong geanticline. This probably originated in the Middle Ordovician; it was certainly present from the Middle Silurian to the Middle Devonian, when folding ended geosynclinal deposition over much of the area. Its northern end is concealed by Mesozoic sediments; it extended southward for at least 65 miles, and may have reached as far as the Murrum-bidgee River west of Canberra—over 200 miles—or beyond.
Late in the Early Devonian, part of the ridge was land, fringed by a few bioherms, between and beyond which were deposited a variety of calcareous and terrigenous sediments making up the Garra Formation. The coral fauna suggests that this sequence is essentially Emsian in age. At the top there appears a distinctive fauna, named after the widespread Xystriphyllum dunstani, which correlates with a number of faunas in eastern Australia. This fauna, which contains occasional Calceola, probably appeared in the Late Emsian; its upward extension is not known.
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