- Usage in publication:
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- Effingham cyclothem
- Modifications:
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- Original reference
- AAPG geologic province:
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- Illinois basin
Summary:
Pg. 13. Effingham cyclothem. Studies by Ekblaw led to tentative recognition of six cyclothems of which Effingham is third in sequence (ascending). Succeeds Divide cyclothem and is followed by Omega cyclothem. If Greenup and Omega limestones are not equivalent, a single standard reference section would include 14 cyclothems of which the Effingham would be eighth in sequence (ascending). Age is Pennsylvanian.
Type locality and origin of name not given. However, type locality of Effingham beds is in sec. 33, T. 8 N., R. 6 E., on tributary to Salt Creek 0.5 mi south of Effingham, Effingham Co., southeastern IL.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1218).
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 ([ ]).