Ripley formation (McNairy sand member) (MSKrm;0)

State	Mississippi
Name	Ripley formation (McNairy sand member)
Geologic age	Upper Cretaceous
Original map label	Krm
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.
Primary rock type	sand
Secondary rock type	clay or mud
Other rock types
Lithologic constituents	Major Unconsolidated > Fine-detrital > ClayRed and white cross-bedded micaceous sand and white sandy clay. Unconsolidated > Coarse-detrital > Sand (Bed)Red and white cross-bedded micaceous sand and white sandy 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. 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. [http://pubs.er.usgs.gov/publication/pp1535]
Geographic coverage	Alcorn - Prentiss - Tippah - Union