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NGMDB

Geologic Unit: Jackfork

Usage:

Jackfork Group (AR,OK*)
Jackfork Sandstone (AR*,OK)


Subunits:

GROUP STATUS (alphabetical): Brushy Knob Formation (AR), Chicksaw Creek Formation (OK), Game Refuge Formation (OK) or Game Refuge Sandstone (OK*), Irons Fork Mountain Formation (AR), Markham Hill Formation (OK*), Prairie Hollow Shale (OK), Prairie Mountain Formation (OK*), Wesley Formation (OK) or Wesley Shale (OK*), Wildhorse Mountain Formation (OK*).


Geologic age:

Mississippian, Late* (local)
Chesterian* (local)
Pennsylvanian, Early*
Morrowan*


Type section, locality, area and/or origin of name:

Not designated. Named from Jackfork Mountain, Pittsburg and Pushmataha Cos., OK (Taff, 1902).


AAPG geologic province:

Ouachita folded belt*
Arkoma basin*


NGMDB

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 ([ ]).

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Page Last Modified: Wed Jun 18 13:59:53 2014