Usage:
Sample Sandstone (IN*, KY*, IL)
Sample Sandstone of West Baden Group (IN)
Sample Formation of West Baden Group (IN)
Sample Sandstone Member of Ridenhower Formation (IL)
Geologic age:
Middle Mississippian (Visean; early Chesterian)*
Type section, locality, area and/or origin of name:
Strong development and good exposures 1 mi east of Sample Station in Brechinridge Co., KY on the Louisville, Henderson, and St. Louis RR (Butts, 1917).
AAPG geologic province:
Illinois 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 ([ ]).