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

State	Mississippi
Name	Ripley formation (McNairy sand member)
Geologic age	Upper Cretaceous
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.
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
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., 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. https://pubs.er.usgs.gov/publication/pp1535
NGMDB product	NGMDB product page for 16555
Counties	Alcorn - Prentiss - Tippah - Union

State

Mississippi

Name

Ripley formation (McNairy sand member)

Geologic age

Upper Cretaceous

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.

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

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., 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.

https://pubs.er.usgs.gov/publication/pp1535

NGMDB product

NGMDB product page for 16555

Counties

Alcorn - Prentiss - Tippah - Union