Usage:
Blackoak Coal Member of Kalo Formation of Cherokee Group (IA)
Geologic age:
Middle Pennsylvanian (Atokan)
Type section, locality, area and/or origin of name:
Type section: along an intermittent tributary of Cedar Creek in an abandoned rock quarry, in NW/4 SE/4 sec. 31, T. 75 N., R. 17 W., Mahaska Co., IA. Named from Blackoak Twp., Mahaska Co., IA (Ravn and others, 1984).
AAPG geologic province:
Iowa shelf
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 ([ ]).