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New Late Eocene mollusks from localized limestone deposits formed by subduction-related methane seeps, southwestern Washington

Published online by Cambridge University Press:  20 May 2016

Richard L. Squires
Affiliation:
Department of Geological Sciences, California State University, Northridge 91330 and 15207 84th Avenue Ct. NW, Gig Harbor, Washington 98335
James L. Goedert
Affiliation:
Section of Vertebrate Paleontology, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, California 90007

Abstract

The trochid archaeogastropod Margarites (Pupillaria) columbiana n. sp., the mytilid bivalve Modiolus (Modiolus) willapaensis n. sp., and the vesicomyid bivalve Calyptogena chinookensis n. sp. are described from the earliest known fossil communities associated with subduction-related methane seeps. The communities are in very localized limestones of late middle to late Eocene age along the southwestern margin of Washington. These limestones contain large numbers of chemosynthetic bivalves and worm tubes, as well as other macrobenthos, that colonized around cool-temperature methane seeps along the landward slopes of an ancient subduction-zone complex.

Calyptogena chinookensis n. sp.is the earliest known species of this genus, which was previously known from Miocene to Recent.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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