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Midway Group

Midway Group
StateArkansas
NameMidway Group
Geologic agePhanerozoic | Cenozoic | Tertiary | Paleocene
Original map labelTm
CommentsMainly clay, calcareous clay (marl), sandy clay, calcareous sandstone and glauconitic limestone. Approximately 640 ft. thick. Marine fossils are common. Marl refers to loosley consolidated calcareous clays, silts and sands containing glauconite
Primary rock typeclay or mud
Secondary rock typemixed clastic/carbonate
Other rock typessandstone; limestone
Lithologic constituents
Major
Unconsolidated > Marl (Bed)
Unconsolidated > Fine-detrital > Clay (Bed)
Minor
Sedimentary > Carbonate > Limestone (Bed)
Unconsolidated > Coarse-detrital > Sand (Calcareous)
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
Dane,C. H.,1929, Upper Cretaceous formations of southwestern Arkansas: Arkansas Geol. Survey Bull.1, 215 pp.
Gordon, M., Jr; Tracey, J. I., Jr; Ellis, M.W., 1958, Geology of the Arkansas bauxite region: U. S. Geological Survey Professional Paper, Report: P 0299, 268 pp.
Geographic coverageClark - Hempstead - Hot Spring - Jackson - Lonoke - Miller - Nevada - Pulaski - Saline

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