Geologic units in Marion county, Arkansas

Boone Formation (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Meramecian Osagean]) at surface, covers 25 % of this area: Boone Formation
Lithology: limestone; chert; shale
St. Peter Sanstone and Everton Formation (Middle Ordovician) (Phanerozoic | Paleozoic | Ordovician-Middle) at surface, covers 26 % of this area: St. Peter Sanstone and Everton Formation (Middle Ordovician)
Lithology: sandstone; dolostone (dolomite); limestone
Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician) (Phanerozoic | Paleozoic | Ordovician-Middle Ordovician-Late) at surface, covers 3 % of this area: Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)
Lithology: limestone; shale; sandstone
Cotter and Jefferson City Dolomites (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers 29 % of this area: Cotter and Jefferson City Dolomites
Lithology: dolostone (dolomite); chert; sandstone; shale
Powell Dolomite (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers 11 % of this area: Powell Dolomite
Lithology: dolostone (dolomite); shale; sandstone; conglomerate