Abyssal molluscan colony of calyptogena in the pliocene strata of the miura peninsula central japan

Niitsuma, N.; Matsushima, Y.; Hirata, D.

Palaeogeography Palaeoclimatology Palaeoecology 71(1-2): 193-203


ISSN/ISBN: 0031-0182
DOI: 10.1016/0031-0182(89)90038-2
Accession: 006977292

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Fossil Calyptogena are found as colonial occurrence in Pliocene abyssal sediments cropping out in the Miura Peninsula, Central Japan. The sediments containing Calyptogena deposited on a talus during drastic rearrangement of the sedimentary basins, caused by a collision process around a trench-trench-trench type triple junction. The population density of Calyptogena shells is 90-130 individuals/m2 which is comparable to the living colony of Calyptogena. The oxygen and carbon isotopes of the fossil shells indicate that the shells lived at abyssal depth and under the influence of seepage of connate water with a high concentration of organic carbon.