Ripley formation (MSKr;0)

State	Mississippi
Name	Ripley formation
Geologic age	Upper Cretaceous
Lithologic constituents	Major 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. Minor 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
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 - Chickasaw - Clay - Kemper - Lee - Noxubee - Oktibbeha - Pontotoc - Prentiss - Tippah - Union

State

Mississippi

Name

Ripley formation

Geologic age

Upper Cretaceous

Lithologic constituents

Major

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.

Minor

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

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 - Chickasaw - Clay - Kemper - Lee - Noxubee - Oktibbeha - Pontotoc - Prentiss - Tippah - Union