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Midway Group including Porters Creek Clay and Clayton Formation

Midway Group - includes Porters Creek Clay - Pale-brown to brownish-gray, massive, blocky clay; locally contains glauconitic sand. Thickness 130 to 170 feet. Also includes Clayton Formation- Glauconitic sand, argillaceous and locally fossiliferous; at base in Hardeman County is an impure fossiliferous limestone. Thickness 30 to 70 feet.
StateTennessee
NameMidway Group including Porters Creek Clay and Clayton Formation
Geologic ageTertiary
Original map labelTm
CommentsWest sheet
Primary rock typeclay or mud
Secondary rock typesand
Other rock typeslimestone
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clayglauconitic clay
Minor
Unconsolidated > Coarse-detrital > Sandglauconitic sand, locally fossiliferous
Incidental
Sedimentary > Carbonate > Limestoneimpure fossiliferous limestone
Map references
Geology available at Tennesse Spatial Data Server which can be found at http://www.tngis.org/geology.html which links to a USGS Water Resources Division site: http://water.usgs.gov/lookup/getspatial?geo250k Tennessee Spatial Data Server site notes: Thanks goes to Jim Julian for researching this improved geology layer from the Tennessee Division of Geology. **Note** - The Tennessee Division of Geology does not endorse this coverage, stating this version is still incomplete and not fit for distribution.
Unit references
Geology available at Tennesse Spatial Data Server which can be found at http://www.tngis.org/geology.html which links to a USGS Water Resources Division site: http://water.usgs.gov/lookup/getspatial?geo250k Tennessee Spatial Data Server site notes: Thanks goes to Jim Julian for researching this improved geology layer from the Tennessee Division of Geology. **Note** - The Tennessee Division of Geology does not endorse this coverage, stating this version is still incomplete and not fit for distribution.
Hardeman, W.D., and others, 1966, Geologic map of Tennessee: Division of Geology, Tennessee Department of Environment and Conservation, scale 1:250,000
Geographic coverageCarroll - Chester - Hardeman - Henderson - Henry - McNairy - Madison

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