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National Geologic Map Database

Geologic Unit: Brushy Knob

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).