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 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 ([ ]).