Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan

Kiel, S., Amano, K. and Jenkins, R. G. (2008) Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan Acta Palaeontologica Polonica, 53 (3). pp. 525-537. DOI 10.4202/app.2008.0310.

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Cretaceous cold-seep deposits of the Yezo Group on Hokkaido, Japan, yield a rich and well-preserved mollusk fauna. The systematics of nine bivalve species previously reported from these deposits can now be reevaluated using newly collected fossils. The fossils include a Cenomanian specimen of Nucinella gigantea with a drill hole possibly made by a naticid, by far the oldest record of a drill hole from a cold seep site. In Japan, Cretaceous seep bivalve assemblages are characterized by (i) the unique occurrence of large specimens of Nucinella (Manzanellidae), (ii) the commonly present nuculid Acila (Truncacila), and (iii) a high diversity of lucinids, possibly as many as four distinct genera. Two new species described are the Albian Acharax mikasaensis (Solemyidae) and the Albian to Campanian Thyasira tanabei (Thyasiridae), of which the former had previously been misidentified as the oldest vesicomyid, the latter as the oldest Conchocele.

Document Type: Article
Keywords: Solemyidae Manzanellidae Lucinidae Thyasiridae hydrocarbon seeps chemosymbiosis Cretaceous Japan deep-sea vents chemosymbiotic bivalves hydrothermal vent northern japan wooden steps environments assemblages mollusca area
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.4202/app.2008.0310
ISSN: 0567-7920
Date Deposited: 12 Jan 2012 05:38
Last Modified: 08 Oct 2012 10:15

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