Usage:
Cypress Sandstone (IL*,KY*,TN*)
Cypress Formation (KY*,MO)
Cypress Sandstone of West Baden Group (IL,IN)
Cypress Formation of West Baden Group (IN)
Geologic age:
Middle Mississippian (Visean; early Chesterian)*
Type section, locality, area and/or origin of name:
Not designated. Named from Cypress Creek, southeast Union Co., IL (Engelmann 1868).
Typical exposures generally accepted as type section, IL (Swann 1963).
Reference section in MO (Thompson, 1986).
AAPG geologic province:
Cincinnati arch*
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 ([ ]).