Jackson group (MSEOj;0)

State	Mississippi
Name	Jackson group
Geologic age	Eocene
Lithologic constituents	Major Unconsolidated > Fine-detrital > ClayYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand. Minor Unconsolidated > MarlYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand. Unconsolidated > Coarse-detrital > SandYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand.
Comments	Secondary unit descriptions from USGS Lexicon website (MS002) and MS005: Upper Eocene (Bartonian-Priabonian) Jackson Group includes the Moodys Branch Formation, the Yazoo Clay, and the Crystal River Formation in the study area. Yazoo Clay is further subdivided into the North Twistwood Creek Clay, the Cocoa Sand, the Pachuta Marl, and the Shubuta Members. Jackson disconformably overlies middle Eocene Claiborne Group (Tew, 1992).
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. USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/ https://ngmdb.usgs.gov/Geolex/search Tew, B.H., 1992, Sequence stratigraphy, lithofacies relationships, and paleogeography of Oligocene strata in southeastern Mississippi and southwestern Alabama: Alabama Geological Survey Bulletin, no. 146, 73 p.
NGMDB product	NGMDB product page for 16555
Counties	Clarke - Hinds - Holmes - Jasper - Madison - Newton - Rankin - Scott - Smith - Wayne - Yazoo

State

Name

Jackson group

Geologic age

Eocene

Lithologic constituents

Major

Unconsolidated > Fine-detrital > ClayYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand.

Minor

Unconsolidated > MarlYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand.

Unconsolidated > Coarse-detrital > SandYazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand.

Comments

Secondary unit descriptions from USGS Lexicon website (MS002) and MS005: Upper Eocene (Bartonian-Priabonian) Jackson Group includes the Moodys Branch Formation, the Yazoo Clay, and the Crystal River Formation in the study area. Yazoo Clay is further subdivided into the North Twistwood Creek Clay, the Cocoa Sand, the Pachuta Marl, and the Shubuta Members. Jackson disconformably overlies middle Eocene Claiborne Group (Tew, 1992).

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.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search

Tew, B.H., 1992, Sequence stratigraphy, lithofacies relationships, and paleogeography of Oligocene strata in southeastern Mississippi and southwestern Alabama: Alabama Geological Survey Bulletin, no. 146, 73 p.

NGMDB product

NGMDB product page for 16555

Counties

Clarke - Hinds - Holmes - Jasper - Madison - Newton - Rankin - Scott - Smith - Wayne - Yazoo