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National Geologic Map Database
Geologic Unit: Leemon
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Map showing publication footprint
  • Usage in publication:
    • Leemon Formation*
  • Modifications:
    • Overview
    • Age modified
  • AAPG geologic province:
    • Illinois basin
Publication:

Harrison, R.W., 1999, Geologic map of the Thebes quadrangle, Missouri and Illinois: U.S. Geological Survey Geologic Quadrangle Map, GQ-1779, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_19294.htm]


Summary:

Leemon Formation mapped undivided with Girardeau Limestone in IL. Consists of coarse-grained oolitic limestone, green shale, and conglomerate. Conglomerate contains rounded clasts of Girardeau Limestone. Crops out only along east bank of Mississippi River just north of Thebes, IL. Age refined to Cincinnatian.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).