- Usage in publication:
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- O'Nan coal member
- Modifications:
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- Original reference
- Dominant lithology:
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- Coal
- AAPG geologic province:
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- Illinois basin
Summary:
Pg. 32, 45 (table 1), pl. 1. O'Nan coal member of Spoon formation (new) of Kewanee group (new). Present in northern Kentucky and southeastern Illinois. Proposed to replace Curlew coal in order to retain name Curlew for underlying limestone; stratigraphically above New Burnside coal member (new) and below Granger sandstone member (new). Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian of Illinois. Cyclical classification is retained but is entirely independent of rock-stratigraphic classification.
Type locality: at Indian Hill, near Curlew, Union Co., west-central KY. Named from Dennis O'Nan Ditch, which flows across north tip of Indian Hill, DeKoven quadrangle.
Source: US geologic names lexicon (USGS Bull. 1200, p. 2827).
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 ([ ]).