Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4732582 | Journal of Asian Earth Sciences | 2007 | 8 Pages |
Abstract
Trigonioides goshourensis n. sp. and Trigonioides amakusensis Kikuchi and Tashiro occur in the late Albian Eboshi Formation of the Goshoura Group in Kyushu, Japan. These Albian species are characterized by three radial pseudocardinal teeth on the thick and wide hinge plate, and are probably ancestors of Cenomanian species of Trigonioides (Kumamotoa) with four radial pseudocardinal teeth. This chronological relation may be important for the correlation of non-marine Cretaceous strata in East Asia. In addition, the habitat of T. amakusensis is interpreted as estuarine tidal flats under brackish water conditions, although Trigonioides is generally a freshwater bivalve genus.
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Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Toshifumi Komatsu, Chen Jinhua, Hiroaki Ugai, Koji Hirose,