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Mineral Resources > Online Spatial Data > Geology > by state > Arkansas Geology

Geologic units in Pike county, Arkansas

Woodbine Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.7 % of this area

Woodbine Formation

Lithology: volcanic rock (aphanitic); sand; gravel; clay or mud; sandstone

Trinity Group (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 9 % of this area

Trinity Group

Lithology: sand; mixed clastic/carbonate; limestone; gypsum; novaculite

Ozan Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.7 % of this area

Ozan Formation

Lithology: mixed clastic/carbonate

Brownstown Marl (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 3 % of this area

Brownstown Marl

Lithology: mixed clastic/carbonate; sand; limestone

De Queen Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.4 % of this area

De Queen Limestone

Lithology: limestone

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 1 % of this area

Terrace deposits - Alluvial deposits on one or more terrace levels

Lithology: alluvial terrace

Stanley Shale (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early) at surface, covers 28 % of this area

Stanley Shale - Includes Chickasaw Creek Chert equivalent of Harlton (1938) near top and Hatton Tuff Lentil and Hot Springs Sandstone Member near base

Lithology: shale; sandstone; siltstone; chert; tuff

Arkansas Novaculite (Phanerozoic | Paleozoic | Devonian-Late Carboniferous Mississippian-Early) at surface, covers 2 % of this area

Arkansas Novaculite - Includes upper division (Mississippian), middle division (Mississippian and Devonian), and lower division (Devonian)

Lithology: novaculite; shale

Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 10 % of this area

Alluvium - Alluvial deposits of present streams

Lithology: alluvium

Atoka Formation - Lower part (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atokan]) at surface, covers 6 % of this area

Atoka Formation - Lower part

Lithology: sandstone; shale

Johns Valley Shale (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Morrowan]) at surface, covers 4 % of this area

Johns Valley Shale

Lithology: shale; sandstone; limestone

Igneous rocks (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Includes undifferentiated altered sedimentary rocks of Paleozoic age at Granite Mountain, Pulaski County, and Mufreesboro, Pike County. Acid to intermediate - Nepheline syenite complexes at Magnet Cove and Potash Sulfur Springs, stocks at Granite Mtn., explosion breccias, and dikes and sills (principally trachyte,tinguaite, phonolite, some ranging from syenite to diabase.) Basic to ultrabasic - Lamproite pipes (Murfreesboro, Pike County) and dikes and sills (principally lamprophyres of fourchite, ouachitite, and monchiquite)

Lithology: alkalic intrusive rock; nepheline syenite; syenite; intrusive carbonatite; trachyte; lamprophyre

Jackfork Sandstone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Morrowan]) at surface, covers 22 % of this area

Jackfork Sandstone

Lithology: sandstone; shale

Tokio Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 9 % of this area

Tokio Formation

Lithology: clay or mud; sand; coal; novaculite

Dierks Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 2 % of this area

Dierks Limestone

Lithology: limestone

Missouri Mountain Shale and Baylock Sandstone (Phanerozoic | Paleozoic | Silurian) at surface, covers 0.5 % of this area

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

Lithology: sandstone; shale; conglomerate; siltstone