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National Geologic Map Database

Geologic Unit: Roby

Usage:

Roby Silt Member of Glasford Formation (IL)


Geologic age:

Quaternary
Pleistocene, middle
Illinoian


Type section, locality, area and/or origin of name:

Type section: Roby section (of Johnson, 1964, p. 35), in NW/4 SE/4 NE/4 sec. 14, T. 15 N., R. 3 W., Sangamon Co., IL. Named from town of Roby, Christian Co., 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 ([ ]).