Usage:
Belfield Member of Spearfish Formation (ND)
Geologic age:
Permian, Late
Type section, locality, area and/or origin of name:
Type section (subsurface): depth-interval from 7,228 to 7,431 ft, Amerada Petroleum Corp. R.E. Newton No. 1 well, in NW/4 SW/4 sec. 31, T. 140 N., R. 99 W., Stark Co., ND. Named from nearby town of Belfield, Stark Co., ND (Dow, 1967).
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 ([ ]).