Usage:
Steamboat Limestone (MT*)
Geologic age:
Cambrian, Middle*
Albertan
Type section, locality, area and/or origin of name:
Type locality: on eastern and northern sides of Steamboat Mountain, [in T. 18 N., R. 8 W., Steamboat Mountain 7.5-min quadrangle, Lewis and Clark Co.], northwestern MT (Deiss, 1933).
Type locality (emended): crest of Prairie Reef, [in T. 21 N., R. 11 W., Prairie Reef 7.5-min quadrangle, Lewis and Clark Co., northwestern MT], from 54 feet below top of peak northwestward to base of Switchback shale (Deiss, 1938, see also Deiss, 1939).
AAPG geologic province:
Montana folded belt*
Sweetgrass arch*
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 ([ ]).