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.)
Early Pennsylvanian (Morrowan)*
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).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).