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Geologic setting of a new Paleocene mammal locality in the northern Powder River Basin, Montana ( USA).

Palaios

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Abstract

The fossil-bearing unit is at approximately the same stratigraphic horizon as the lowest coal bed in the Tongue River Member of the Fort Union Formations. The fossils occur approx 50m above the base of the Tongue River Member in a 0.6m thick, yellowish-gray, sandy conglomerate that is interpreted to be a fluvial channel-lag deposit. The fauna includes fossils of fish, turtles, crocodiles, and mammals. Mammals thus far recovered include 21 species distributed between 17 families. Genera known from rocks of both the Torrejonian and the Tiffanian land mammal ages (middle and late Paleocene) are present, but the evolutionary stage of Aphronorus and the mutual presence of Nannodectes and a primitive species of Ectocion suggest a Tiffanian (late Paleocene) age for the deposit.-from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geologic setting of a new Paleocene mammal locality in the northern Powder River Basin, Montana ( USA).
Series title:
Palaios
Volume
2
Issue:
1
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
87
Last page:
90
Number of Pages:
4