|Geologic age||Upper Cretaceous|
Sedimentary > Carbonate > LimestoneGray to greenish-gray fine glauconitic sand, clay, and sandy limestone.
Unconsolidated > Coarse-detrital > SandGray to greenish-gray fine glauconitic sand, clay, and sandy limestone.
Unconsolidated > Fine-detrital > ClayGray to greenish-gray fine glauconitic sand, clay, and sandy limestone.
Sedimentary > Carbonate > Limestone > ChalkSouth of Oktibbeha County is very sandy micaceous chalk.
|Comments||The Ripley formation on the map combines units Kr and Krm in the same description, but describes them separately and each has a unique symbol/color, so have split them up here.|
|Stratigraphic units||Selma Group|
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., scale 1:500,000.
Wingard, G.L., 1993, A detailed taxonomy of Upper Cretaceous and lower Tertiary Crassatellidae in eastern North America; an example of the nature of extinction: U.S. Geological Survey Professional Paper, 1535, 131 p.
|Counties||Alcorn - Chickasaw - Clay - Kemper - Lee - Noxubee - Oktibbeha - Pontotoc - Prentiss - Tippah - Union|