- Usage in publication:
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- Briar Hill cyclothem
- Modifications:
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- Original reference
- AAPG geologic province:
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- Illinois basin
Summary:
Pg. 43, 52 (table 2), pl. 1. Briar Hill cyclothem. Proposed for unit formerly termed Crab Orchard cyclothem. Occurs above St. David cyclothem and below Brereton cyclothem. Age is Pennsylvanian. Report presents new rock-stratigraphic classification of Pennsylvanian strata in Illinois. Cyclical classification retained but is entirely independent of rock-stratigraphic classification; includes rocks also assigned to Briar Hill (No. 5) coal member of Carbondale formation of Kewanee group (new).
Named from Briar Hill near village of DeKoven, Union Co., western KY.
Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 472).
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 ([ ]).