Usage:
Fort Russell till member [informal] of Glasford Formation (IL,IA)
Fort Russell till facies [informal] in Vandalia Till Member of Glasford Formation (IL)
Considered informal. The rank or lithologic term should not be capitalized.
Geologic age:
Quaternary
Pleistocene
Illinoian
Type section, locality, area and/or origin of name:
Fort Russell Twp., Madison Co., IL.
AAPG geologic province:
Illinois basin
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 ([ ]).