Usage:
Ashmore Tongue of Henry Formation of Mason Group (IL*-subsurface)
Geologic age:
Pleistocene (Wisconsinan Age)*
Type section, locality, area and/or origin of name:
Type section: Charleston section, in Charleston stone quarry pits, on both sides of Embarras Valley, about 5 mi (8 km) east-northeast of Charleston, in SW/4 NW/4 sec. 5, T. 12 N., R. 10 E., Ashmore 7.5-min quadrangle, Coles Co., east-central IL. Named from village of Ashmore, Coles Co., east-central IL (see Hansel and Johnson, 1996; name credited to Ford, 1973).
Principal reference section: Wedron section, in highwalls of pits in Wedron Silica Company quarries, in secs. 8, 9, 10, and 16, T. 34 N., R. 4 E., Wedron 7.5-min quadrangle, La Salle Co., IL (Hansel and Johnson, 1996).
AAPG geologic province:
Illinois basin*
Wisconsin arch*
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 ([ ]).