Usage:
Cahokia Alluvium (IL)
Cahokia Formation (IL)
Geologic age:
Quaternary
Pleistocene
Illinoian(?)
Wisconsinan
Holocene
Type section, locality, area and/or origin of name:
Type section (subsurface): depth-interval 0 to 13.7 m, Illinois Geological Survey test hole 2, 4.8 km southwest of Cahokia and 1.3 km south of center of East Carondelet, St. Clair Co., south-central IL (Willman and Frye, 1970).
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 ([ ]).