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National Geologic Map Database

Geologic Unit: Collins Ranch

Usage:

Collins Ranch Member of Tullock Formation (MT)


Geologic age:

Tertiary
Paleocene, early


Type section, locality, area and/or origin of name:

Type section: sec. 12, T. 22 N., R. 43 E., McCone Co., MT (Rigby and Rigby, 1990).


AAPG geologic province:

Williston basin


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).