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National Geologic Map Database

Geologic Unit: Cameron Creek

Usage:

Cameron Creek Member of Tyler Formation of Amsden Group (MT*)
Cameron Creek Member of Tyler Formation (ND*)
Cameron Creek Member of Amsden Group (MT-recognized locally in Fergus Co.)


Geologic age:

Early Pennsylvanian (Morrowan)*


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

Type locality: canyon of one of tributaries of south-draining Cameron Creek, a few hundred feet north of Stonehouse Ranch headquarters, in sec. 31, T. 11 N., R. 21 E., Golden Valley Co., central MT, on southeast side of Big Snowy Mountains (Gardner, 1959).
Reference section (Tyler Formation): along prominent cliff forming the west end of Alaska Bench (locally called Beacon Hill), in NE/4 SW/4 sec. 25 and SW/4 sec. 36, T. 13 N., R. 19 E., and extending into NE/4 sec. 1, T. 12 N., R. 19 E. [unsurveyed], [Half Moon Canyon 7.5-min quadrangle (1970; 1973 ed.)], Fergus Co., central MT (Maughan and Roberts, 1967).


AAPG geologic province:

Williston basin*
Powder River basin*
Central Montana uplift*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).