- Usage in publication:
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- Conover Bentonite Bed
- Modifications:
-
- Original reference
- Dominant lithology:
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- Bentonite
- AAPG geologic province:
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- Iowa shelf
Summary:
Pg. 49. Conover Bentonite Bed of Rivoli Member of Dunleith Formation, and Conover Bentonite Bed of Loves Park Member of Dunleith Formation (in Illinois). Present in Iowa and Illinois. Consists of bentonite clay, 0.025 m thick. At type section, is topmost unit of Rivoli Member; underlies Sherwood Member of Dunleith Formation. Age is Middle Ordovician.
Type section: Engineers Old Cut section, stream diversion channel, 2.4 km west of Decorah, in SE/4 NE/4 sec. 18, T. 98 N., R. 8 W., [approx. Lat. 43 deg. 18 min. 24 sec. N., Long. 91 deg. 49 min. 32 sec. W., Decorah 7.5-min quadrangle], Winneshiek Co., northeast IA.
Named from town of Conover, 11.2 km southwest of type section, [Fort Atkinson 7.5-min quadrangle], Winneshiek Co., northeast IA.
Source: US geologic names lexicon (USGS Bull. 1564, p. 36-37).
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 ([ ]).