Geologic units in Logan county, Arkansas

Savanna Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Des Moinesian]) at surface, covers 12 % of this area: Savanna Formation
Lithology: shale; sandstone; coal
Boggy Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Des Moinesian]) at surface, covers < 0.1 % of this area: Boggy Formation
Lithology: shale; sandstone
Atoka Formation - Middle part (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atokan]) at surface, covers 13 % of this area: Atoka Formation - Middle part
Lithology: sandstone; shale
McAlester Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moinesian]) at surface, covers 14 % of this area: McAlester Formation
Lithology: shale; sandstone; coal
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 0.7 % of this area: Terrace deposits - Alluvial deposits on one or more terrace levels
Lithology: alluvial terrace
Harthshorne Sandstone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moinesian]) at surface, covers 14 % of this area: Harthshorne Sandstone
Lithology: sandstone; shale; coal
Atoka Formation - Upper part (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atokan]) at surface, covers 39 % of this area: Atoka Formation - Upper part
Lithology: sandstone; shale
Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 3 % of this area: Alluvium - Alluvial deposits of present streams
Lithology: alluvium
Atoka Formation - Lower part (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atokan]) at surface, covers 2 % of this area: Atoka Formation - Lower part
Lithology: sandstone; shale

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