Missouri Mountain Shale and Baylock Sandstone

The Baylock Sandstone is present only in the Cross, Cossatot, and Trap Mountains. Missouri Mountain Shale is mapped with Polk Creek Shale and Bigfork Chert in the area between Paron, Saline County, and Little Rock.
State Arkansas
Name Missouri Mountain Shale and Baylock Sandstone
Geologic age Late Silurian
Lithologic constituents
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Comments Missouri Mtn. Shale-argillitic shale with minor sandstone and conglomerate (250 ft.); Baylock Sandstone-sandstone with minor siltstone and shale (1000 ft.) Approximatly 1250 ft. maximum thickness. Summary- 75% sandstone, 20% shale, 5% other

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.

NGMDB product
Counties Garland - Hot Spring - Montgomery - Pike - Polk - Pulaski - Saline