- Usage in publication:
-
- Excello Shale Member
- Modifications:
-
- Revised
- AAPG geologic province:
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- Iowa shelf
Summary:
Extended into Lucas Co, IA on the Iowa shelf from MO as the basal member of the newly named Mouse Creek Formation, basal formation of Marmaton Group of Des Moines Supergroup. Overlies Mulky Coal Member of Swede Hollow Formation (new) of Cherokee Group of Des Moines Supergroup. Underlies Blackjack Creek Limestone Member, upper member of Mouse Creek. Consists of 2 ft of dark gray shale with abundant brown phosphate nodules that grades upward into 2.9 ft of green-brown sparsely fossiliferous mudstone at type section of Mouse Creek. Graphic section. Nomenclature chart. Of Pennsylvanian, Desmoinesian age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).