Citronelle formation (MSPSc;0)

State	Mississippi
Name	Citronelle formation
Geologic age	Pleistocene
Original map label	Pc
Comments	Secondary unit desrciption from USGS Lexicon website (MS002) and MS011: The Citronelle Formation is the most widely distributed unit in the study area, occurring in all 35 quads mapped in south-central MS, and occupying the highest elevations. It is composed of gravel and sandstone with a few thin layers of silt or clay. Has undergone considerable weathering. Contact with the underlying Hattiesburg Formation is an easily recognized regional unconformity, marked by a thin, dark-brown to black, iron-cemented sand. The lenses of clay consist dominantly of kaolinite and illite and tend to be laminated. Large-scale cross-bedding is evident. Underlies terrace deposits. Age is Pliocene and Pleistocene (Li and Meylan, 1994).
Primary rock type	sand
Secondary rock type	gravel
Other rock types	clay or mud
Lithologic constituents	Major Unconsolidated > Coarse-detrital > GravelRed gravel Unconsolidated > Coarse-detrital > SandRed sand Minor Unconsolidated > Fine-detrital > ClayWhite 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. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/] Li, Zebao and Meylan, M.A., 1994, Lithostratigraphy and petrology of Neogene and Pleistocene sedimentary rocks, south-central Mississippi: Gulf Coast Association of Geological Societies Transactions, v. 44, p. 383-392.
Geographic coverage	Amite - Copiah - Covington - Forrest - Franklin - George - Greene - Hancock - Harrison - Hinds - Jackson - Jefferson - Jefferson Davis - Lamar - Lawrence - Lincoln - Marion - Pearl River - Perry - Pike - Simpson - Stone - Walthall - Wilkinson