Usage:
No current usage.
(†De Smet Formation (SD) considered abandoned. Rocks included in Poorman Formation. See Poorman.)
Geologic age:
Precambrian
Type section, locality, area and/or origin of name:
Named from plentiful exposures around north end of main open cut southwest of De Smet shaft, Homestake Mine area, Lead district, Lawrence Co., southwestern SD (Hosted and Wright, 1923).
AAPG geologic province:
Midcontinent region
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 ([ ]).