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Geologic Unit: Summit
Map showing publication footprint
  • Usage in publication:
    • Summit Coal Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
Publication:

Ravn, R.L., Swade, J.W., Howes, M.R., Gregory, J.T., Anderson, R.R., and Van Dorpe, P.E., 1984, Stratigraphy of the Cherokee Group and revision of Pennsylvanian stratigraphic nomenclature in Iowa: Iowa Geological Survey Bureau Technical Information Series, no. 12.


Summary:

Extended into Lucas Co, IA on the Iowa shelf as a formally named member. The upper member of the Morgan School Shale of the Marmaton Group of the Des Moines Supergroup. Summit coal, the informal term, was previously included in the Little Osage Shale. Little Osage in this report is restricted to the rocks above the Summit. Overlies unnamed green shale of the Morgan School. Underlies the Little Osage Member, newly assigned to the Stephens Forest Formation (new) of the Marmaton. Is a weathered coal 0.1 ft thick at type "exposure" of Morgan School Shale. 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 ([ ]).

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