- Usage in publication:
-
- Flannigan cyclothem
- Modifications:
-
- Original reference
- AAPG geologic province:
-
- Illinois basin
Summary:
Pg. 9, 10; J.M. Weller, 1942, Illinois Acad. Scl. Trans., v. 35, no. 2, p. 145 (table 1). Flannigan cyclothem in McLeansboro group. In sequence, occurs below Macoupin cyclothem and above Shoal Creek cyclothem. Thickness about 26 feet. Age is Pennsylvanian.
Named from exposures in Flannigan Twp., Hamilton Co., southeastern IL.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1363).
- Usage in publication:
-
- Flannigan cyclothem
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Illinois basin
Summary:
Pg. 52 (table 2), pl. 1. Flannigan cyclothem in Bond formation (new) of McLeansboro group. Recognized in southeastern Illinois. Age is Pennsylvanian. 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. 1363).
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 ([ ]).