Usage:
Sprole Silt (MT*-recognized locally in Roosevelt Co.)
Geologic age:
Quaternary*
Pleistocene*
Wisconsinan*
Type section, locality, area and/or origin of name:
Exposure 2 mi northwest of Sprole, a siding on the Great Northern Railway, in NW/4 SW/4 sec. 3, T. 27 N., R. 51 E., Roosevelt Co., MT. Named from Sprole (Colton, 1963).
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 ([ ]).