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St. Peter Sanstone and Everton Formation (Middle Ordovician)

St. Peter Sanstone and Everton Formation (Middle Ordovician)
State Arkansas
Name St. Peter Sanstone and Everton Formation (Middle Ordovician)
Geologic age Phanerozoic | Paleozoic | Ordovician-Middle
Comments St. Perter Sanstone-white saccharoidal sandstone (200ft.); Everton FM-mainly dolomite, limestone interbedded with sandstone and some massive sandstone beds (205 ft.). Approximately 405 ft. maximum thickness. Summary-55% sandstone, 35% dolomite, 10% limestone.
Primary rock type sandstone
Secondary rock type dolostone (dolomite)
Other rock types limestone
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (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.
Counties Baxter - Boone - Carroll - Fulton - Independence - Izard - Lawrence - Madison - Marion - Newton - Searcy - Sharp - Stone