Usage:
Brushy Knob Formation of Jackfork Group (AR)
Geologic age:
Early to Middle Pennsylvanian (Morrowan)*
Type section, locality, area and/or origin of name:
In secs. 13 through 16, T. 1 S., R. 28 W., Polk Co., AR (Morris, 1971).
Reference locality [not described]: along Mill Creek Mountain, T. 1 N., R. 27 W., Montgomery Co., AR (Morris, 1971).
AAPG geologic province:
Ouachita folded belt
Arkoma 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 ([ ]).