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New land snails (Archaeogastropoda, Helicinidae) from the Miocene (Early Barstovian) Flint Creek beds of western Montana

Published online by Cambridge University Press:  19 May 2016

Harold G. Pierce  and
Donald L. Rasmussen
Harold G. Pierce
Affiliation:
Research Associate, University of Nebraska State Museum, Lincoln 68588
Donald L. Rasmussen
Affiliation:
Research Associate, Museum of the Rockies, Montana State University, Bozeman 59717
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Abstract

Waldemaria monticola Pierce n. sp. and “Hendersonia” valida Pierce n. sp. are described from fluviatile sediments of the intermontane Flint Creek Basin of western Montana. The genus Waldemaria was previously known only from Japan. The presence of these two genera suggest a marked climatic cooling when compared with western North American Eocene–Oligocene faunas. The stratigraphy of the Flint Creek beds, and the associated vertebrate fauna, diagnostic of an early Barstovian age (17–15 Ma), is summarized.

Type
Research Article
Information
Journal of Paleontology , Volume 63 , Issue 6 , November 1989 , pp. 846 - 851
Copyright
Copyright © The Paleontological Society 

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