NON-MARINE FERGANOCONCHA (BIVALVIA) FROM THE MIDDLE JURASSIC IN DAOHUGOU AREA, NINGCHENG COUNTY, INNER MONGOLIA, CHINA
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Abstract:
Non-marine bivalve Ferganoconcha is widely distributed in the Lower and Middle Jurassic of Northern China, Central Asia, Siberia and Ural regions. The occurrence of the Ferganoconcha sibirica from the Daohugou Bed in Daohugou area indicates that the bed is correlatable with the Haifanggou Formation in western Liaoning and the Jiulongshan Formation in northern Hebei with an age ranging from late Early Jurassic to Middle Jurassic. Taking into account the age reflected by the insect and conchostracan fossils, the age of the Daohugou Bed is probably early to middle Middle Jurassic. In addition, the species F. sibirica is systematically emended based on the recent progress in the classification of the family Ferganoconchidae.
