Wilcox Group (ARTw;0)

State	Arkansas
Name	Wilcox Group
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Eocene-Early
Original map label	Tw
Comments	Mainly interbedded sand, argillaceous sand, silt, clay, gravel and lignite. Approximate thickness is 1200 ft. in the Mississippi Embayment. Cyclic marine-nonmarine units formed in a fluvial-deltatic system. Some bauxite production in the Berger FM
Primary rock type	sand
Secondary rock type	silt
Other rock types	clay or mud; gravel; coal
Lithologic constituents	Major Unconsolidated > Fine-detrital (Bed) Unconsolidated > Coarse-detrital > Sand (Bed) Minor Sedimentary > Coal (Bed) Unconsolidated > Coarse-detrital > Gravel (Bed)
Map references	Haley, B. R., Glick, E. E., Bush, W. V.; Clardy, B. F.; Stone, C. G.; Woodward, M. B., Zachry, D.L., 1993, Geologic Map of Arkansas: U.S.Geological Survey Special Geologic Map. Scale 1:500K
Unit references	Hosman, R.L., 1996, Regional stratigraphy and subsurface geology of Cenozoic deposits, Gulf Coastal Plain, south-central United States:U.S. Geological Survey Professional Paper, Report: P 1416-G, pp.G1-G35 [http://pubs.er.usgs.gov/publication/pp1416G]
Geographic coverage	Clark - Clay - Craighead - Dallas - Grant - Greene - Hempstead - Hot Spring - Lafayette - Lonoke - Miller - Nevada - Ouachita - Pulaski - Saline