Mineral Resources On-Line Spatial Data
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Geologic units in Carroll county, Tennessee
[Additional scientific data in this geographic area]
- McNairy Sand (Cretaceous) at surface, covers 21 % of this area
McNairy Sand - Predominantly sand, in places interbedded with silty light-gray clays. Fine-grained sand at base, locally contains heavy minerals. Thickness about 300 feet.
- Coon Creek Formation (Cretaceous) at surface, covers 0.7 % of this area
Coon Creek Formation - Fossiliferous, micaceous sand, silty and glauconitic; locally fossiliferous sandy clay at base. Siderite concretions common in upper part. Thickness about 140 feet.
- Loess (Quaternary) at surface, covers 22 % of this area
Loess - Clayey and sandy silt, gray to brown, massive. Maximum thickness about 100 feet along bluffs of Mississippi River; thins eastward. (Minimum mapped thickness 4 feet.)
- Claiborne and Wilcox Formation (Tertiary) at surface, covers 28 % of this area
Claiborne and Wilcox Formations -- Irregularly bedded sand, locally interbedded with lenses and beds of gray to white clay, silty clay, lignitic clay, and lignite. Thickness more than 400 feet.
- Alluvial deposits (Quaternary) at surface, covers 9 % of this area
Alluvial Deposits - Sand, silt, clay, and gravel. In flood plain of Mississippi River more than 100 feet thick; in smaller streams generally less than 20 feet thick.
- Midway Group including Porters Creek Clay and Clayton Formation (Tertiary) at surface, covers 20 % of this area
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.