|Name||Porters Creek formation|
Unconsolidated > Fine-detrital > ClayDark-gray clay, north of Clay County contains slightly glauconitic, micaceous sand lenses.
Unconsolidated > Coarse-detrital > SandDark-gray clay, north of Clay County contains slightly glauconitic, micaceous sand lenses.
|Stratigraphic units||Midway 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.
|Counties||Benton - Calhoun - Chickasaw - Clay - Kemper - Lafayette - Lauderdale - Marshall - Noxubee - Oktibbeha - Pontotoc - Tippah - Union - Webster - Winston|