Eutaw formation (Tombigbee sand member)

Massive fine glauconitic sand.
State Mississippi
Name Eutaw formation (Tombigbee sand member)
Geologic age Late Cretaceous
Lithologic constituents
Unconsolidated > Coarse-detrital > SandMassive fine glauconitic sand.
Comments Units Ke and Ket are combined in the map description, but have separate symbols, colors and descriptions, so I split them up. Secondary unit descriptions from USGS Lexicon website (MS002) and MS009: Tombigbee has been considered a member of the Eutaw Formation since Stephenson (1911). Though the two are without a doubt closely related, the Tombigbee is a lithologically distinct, mappable unit, and it is frequently very fossiliferous, while the typical Eutaw is not. It was deposited in a quiet zone transitional to shelf muds unlike the lower Eutaw, which was deposited in shallow, high-energy near-shore waters. Author suggests that perhaps the Tombigbee should be removed from the Eutaw (Russell and Keady, 1990).

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:

Dowsett, H.J., 1989, Documentation of the Santonian-Campanian and Austinian-Tayloran Stage boundaries in Mississippi and Alabama using calcareous microfossils: U.S. Geological Survey Bulletin, 1884, 20 p.

Russell, E.E. and Keady, D.M., 1990, Geologic mapping of Upper Cretaceous units in northeastern Mississippi, IN Bograd, M.B.E., and Dockery, D.T., III, eds., Geologic mapping in Mississippi; proceedings of the 1989 MISGEOMAP conference: Mississippi Office of Geology Circular, no. 3, p. 15-16.

NGMDB product
Counties Alcorn - Clay - Itawamba - Lee - Lowndes - Monroe - Prentiss - Tishomingo