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Geologic units in Nacogdoches county, Texas

Sparta Sand (Eocene) at surface, covers 20 % of this area

Sparta Sand

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

Queen City Sand

Weches Formation (Eocene) at surface, covers 14 % of this area

Weches Formation

Carizzo Sand (Eocene) at surface, covers 13 % of this area

Carizzo Sand

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

Reklaw Formation

Alluvium (Holocene) at surface, covers 9 % of this area

Alluvium

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

Cook Mountain Formation

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

Wilcox Group, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 4 % of this area

Terrace deposits

Yegua Formation (Middle Eocene) at surface, covers 3 % of this area

Yegua Formation