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  5. Arkansas geologic units

Geologic units in Hempstead county, Arkansas

Alluvium (Holocene) at surface, covers 23 % of this area

Alluvial deposits of present streams

Nacatoch Sand (Late Cretaceous) at surface, covers 16 % of this area

Nacatoch Sand

Wilcox Group (Early Eocene) at surface, covers 15 % of this area

Wilcox Group

Midway Group (Paleocene) at surface, covers 10 % of this area

Midway Group

Arkadelphia Marl (Late Cretaceous) at surface, covers 9 % of this area

Arkadelphia Marl

Terrace deposits (Late Pleistocene) at surface, covers 9 % of this area

Alluvial deposits on one or more terrace levels

Marlbrook Marl (Late Cretaceous) at surface, covers 5 % of this area

Marlbrook Marl

Brownstown Marl (Late Cretaceous) at surface, covers 4 % of this area

Brownstown Marl

Tokio Formation (Late Cretaceous) at surface, covers 3 % of this area

Tokio Formation

Ozan Formation (Late Cretaceous) at surface, covers 3 % of this area

Ozan Formation

Sartoga Chalk (Late Cretaceous) at surface, covers 2 % of this area

Sartoga Chalk

Woodbine Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

Woodbine Formation