Usage:
Imo interval (informal) in Pitkin Limestone (AR)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Late Mississippian (Chesterian)
Type section, locality, area and/or origin of name:
Type locality: in SE/4 SE/4 sec. 3, and NW/4 NW/4 sec. 11, T. 13 N., R. 17 W., Searcy Co., AR (Gordon, 1964).
AAPG geologic province:
Arkoma 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 ([ ]).