- Usage in publication:
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- Gila cyclothem
- Modifications:
-
- Original reference
- AAPG geologic province:
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- Illinois basin
Summary:
Pg. 9, 27-28; J.M. Weller, 1942, Illinois Acad. Sci. Trans., v. 35, no. 2, p. 145 (table 1). Gila cyclothem in McLeansboro Group. Lies below the Woodbury cyclothem (new) and above the Greenup cyclothem (new). Thickness at type locality about 20 feet; thins northeastward. Includes Gila limestone. Age is Pennsylvanian.
Type locality: along Mint Creek, [in NE/4 SW/4 sec. 31, T. 8 N., R. 9 E.], southeast of Gila, Jasper Co., southeastern IL.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1503-1504).
- Usage in publication:
-
- Gila cyclothem
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Illinois basin
Summary:
Pg. 62 (table 2), 55 (table 3), pl. 1. Gila cyclothem. In Mattoon formation (new) of McLeansboro group. Above Greenup cyclothem and below Woodbury cyclothem. Presentation of new rock-stratigraphic classification of Pennsylvanian strata in Illinois; cyclical classification is independent of rock-stratigraphic classification.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1503-1504).
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 ([ ]).