Geologic units in Lawrence county, Arkansas

Geologic units in Lawrence county, Arkansas

Additional scientific data in this geographic area

Terrace deposits (Late Pleistocene) at surface, covers 29 % of this area

Alluvial deposits on one or more terrace levels

St. Peter Sanstone and Everton Formation (Middle Ordovician) (Middle Ordovician) at surface, covers 19 % of this area

St. Peter Sanstone and Everton Formation (Middle Ordovician)

Dune sand (Late Pleistocene) at surface, covers 14 % of this area

Deposited mostly on terrace deposits of the second level. Younger than some terrace deposits, older than others

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Holocene) at surface, covers 12 % of this area

Alluvial deposits of local streams or of overbank flow of major streams - In some areas includes deposits in abandoned meanders of major streams

Powell Dolomite (Early Ordovician) at surface, covers 12 % of this area

Powell Dolomite

Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Holocene) at surface, covers 5 % of this area

Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.

Cotter and Jefferson City Dolomites (Early Ordovician) at surface, covers 5 % of this area

Cotter and Jefferson City Dolomites

Cretaceous rocks (Cretaceous) at surface, covers 3 % of this area

Cretaceous rocks

Alluvium and terrace deposits (Holocene to Pleistocene) at surface, covers 2 % of this area

Alluvial deposits of present streams and on one or more terrace levels

Sand and clay (Cretaceous) at surface, covers 0.4 % of this area

Sand and clay

Boone Formation (Early Mississippian- Meramecian to Osagean) at surface, covers < 0.1 % of this area

Boone Formation

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian) (Early Mississippian to Early Devonian) at surface, covers < 0.1 % of this area

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian)

Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician) (Late Ordovician to Middle Ordovician) at surface, covers < 0.1 % of this area

Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)