Stanley Shale (ARMs;0)

State	Arkansas
Name	Stanley Shale
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Mississippian-Early
Original map label	Ms
Comments	Black shale to slate alternating with sandstone, siltstone some chert and tuff. Approximately 9500 ft. maximum thickness. Geosynclinal facies-composed mainly of alternating shales and sandstone including some tuffaceous beds (5600 ft.), and fossiliferous siliceous shale and graywacke.
Primary rock type	shale
Secondary rock type	sandstone
Other rock types	siltstone; chert; tuff
Lithologic constituents	Major Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed) Minor Sedimentary > Chemical > Chert (Bed) Igneous > Volcanic (Pyroclastic, tuff)
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	Clark - Garland - Hot Spring - Howard - Montgomery - Perry - Pike - Polk - Pulaski - Saline - Scott - Sevier - Yell