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Geologic Unit: Rivoli
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  • Usage in publication:
    • Rivoli Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
Publication:

Willman, H.B., and Kolata, D.R., 1978, The Platteville and Galena Groups in northern Illinois: Illinois Geological Survey Circular, no. 502, __ p.


Summary:

Pg. 49. Rivoli Member of Dunleith Formation. Revised to include (ascending) Calmar and Conover Bentonite Beds (both new). Underlies Sherwood Member of Dunleith Formation. Age is Middle Ordovician. [See entries under Calmar and Conover.]

Source: Inferred from US geologic names lexicon (USGS Bull. 1564, p. 26, 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 ([ ]).

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