Paleocene fresh-water mollusks from southern Montana
1948; United States Government Publishing Office; Linguagem: Inglês
10.3133/pp214c
ISSN2330-7102
Autores Tópico(s)Isotope Analysis in Ecology
ResumoTwenty-two species of fresh-water mollusks (two new) are described and illustrated from 45 localities in southern Montana.The genera Viviparus, Campeloma, Lioplacodes, Fluminicola, Pleurocera, Goniobasis, Ferrissia, Palaeancylus (new), Pleurolimnaea, Physa, Aplexa, Gyraulus, Carinorbis, Sphaerium, and Elliptio are represented.The fauna conies mainly from the Tongue River member of the Fort Union formation and is assigned to the Paleocene, though it seems divisible into an older and a younger group of species and extends into beds that on other grounds are considered to belong to the Wasatch formation and to be of early Eocene age.
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