Collier Shale (AROc;0)

State	Arkansas
Name	Collier Shale
Geologic age	Phanerozoic \| Paleozoic \| Ordovician-Early
Original map label	Oc
Comments	Black clay shale with minor thin beds of limestone and chert. Approximately 1000 ft. maximum thickness
Primary rock type	shale
Secondary rock type	limestone
Other rock types	chert
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed) Minor Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Chemical > Chert (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	Ferguson, J.G., 1920. Outlines of the geology, soils, and minerals of the State of Arkansas: Arkansas State Bureau of Mines, Manufactures and Agriculture,192 pp. Stone, C. G. and Bush, W. V. 1982, Summary of the geology of the eastern Ouachita Mountains, Arkansas: Guidebook - Arkansas Geological Commission, vol.82-2, 24 pp.
Geographic coverage	Garland - Montgomery