The Pelecypods Undulomya,Cosmomya and Palaeocosmomya in the permian of India and Western Australia |
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| Authors: | J M Dickins S C Shah |
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| Institution: | 1. Geological Branch, Bureau of Mineral Resources, Geology &2. Geophysics , Canberra, A.C.T.;3. Palaeontological Division , Geological Survey of India , Calcutta, India |
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| Abstract: | Goniomya sp. ind., and Goniomya sp. ind. aff. G. kasanensis (Geinitz), described by Diener (1903) from the Permian of the Central Himalayas, are shown to belong to Undulomya. Goniomya uhligi Holdhaus, 1913, thought by Holdhaus to be of Jurassic age, is also regarded as an Undulomya and con‐specific with or closely related to the above species. Cosmomya egregaria Holdhaus, 1913, the type species of Cosmomya Holdhaus, 1913, which comes from the same locality as Undulomya uhligi, is regarded as congeneric with Palaeocosmomya Fletcher, 1946. Palaeocosmomya therefore, becomes a synonym of Cosmomya, but is retained at the subgeneric level. The evidence now available indicates that Undulomya uhligi and Cosmomya egregaria are of Late Permian age. Undulomya and Cosmomya are regarded as two quite distinctive genera which also differ from the Jurassic genus Goniomya, in which species of both have hitherto often been included. Undulomya and Cosmomya have so far been recorded from Australia, India, Madagascar and the Soviet Union and Cosmomya, in addition, from Greenland. |
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| Keywords: | uplift erosion isostatic rebound vertical movements East Australian Highlands |
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