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National Geologic Map Database

Geologic Unit: Burroak

Usage:

Burroak Shale Member of Deer Creek Limestone of Shawnee Group (IA*,KS*,MO*,NE*)
Burroak Shale Member of Deer Creek Formation of Shawnee Group (MO)
Also called /Larsh-Burroak shale member [informal] of Deer Creek Formation of Shawnee Group.

[The use of a hyphen between undifferentiated [members] is not considered proper notation (CSN, 1933).]


Geologic age:

Late Pennsylvanian*
Mississippian, Late (MO)


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

Roadcuts and ravines near Burr Oak School, in E/2 sec. 21, T. 71 N., R. 43 W., Freemont Co., IA, about 6 mi south of Pacific Junction, IA, and about 3.5 mi north of Bartlett in Mills Co., southwestern IA (Condra and Reed, 1937).


AAPG geologic province:

Forest City 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 ([ ]).