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Vicksburg group and Chickasawhay limestone

Vicksburg group and Chickasawhay limestone - Chickasawhay limestone, sandy limestone, and sand, present only in eastern MS (mapped with it is the overlying Paynes Hammock sand of Miocene age); Vicksburg group, predominantly limestone and marl, but contains some bentonite and near the top, chocolate-colored clay and some sand.
State Mississippi
Name Vicksburg group and Chickasawhay limestone
Geologic age Oligocene
Primary rock type limestone
Secondary rock type sand
Other rock types bentonite; clay or mud
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Minor
Unconsolidated > Marl
Unconsolidated > Coarse-detrital > Sand
Incidental
Sedimentary > Clastic > Mudstone > Claystone > BentoniteVicksburg group, predominantly limestone and marl, but contains some bentonite.
Unconsolidated > Fine-detrital > ClayChocolate-colored clay.
Map references
Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS.
Unit references
Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS.
Counties Claiborne - Hinds - Issaquena - Madison - Smith - Warren