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  5. Texas geologic units

Geologic units in San Augustine county, Texas

Yegua Formation (Middle Eocene) at surface, covers 24 % of this area

Yegua Formation

Sparta Sand (Eocene) at surface, covers 14 % of this area

Sparta Sand

Cook Mountain Formation (Eocene) at surface, covers 12 % of this area

Cook Mountain Formation

Carizzo Sand (Eocene) at surface, covers 11 % of this area

Carizzo Sand

Weches Formation (Eocene) at surface, covers 9 % of this area

Weches Formation

Cadell Formation (Eocene) at surface, covers 7 % of this area

Cadell Formation

Alluvium (Holocene) at surface, covers 7 % of this area

Alluvium

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers 5 % of this area

Wilcox Group, undivided

Reklaw Formation (Eocene) at surface, covers 4 % of this area

Reklaw Formation

Yazoo Formation (Late Eocene) at surface, covers 3 % of this area

Yazoo Formation

Terrace deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Terrace deposits

Nash Creek Formation (Oligocene) at surface, covers 0.4 % of this area

Nash Creek Formation

Queen City Sand (Eocene) at surface, covers 0.2 % of this area

Queen City Sand