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Geologic units in Smith county, Texas

Queen City Sand (Eocene) at surface, covers 49 % of this area

Queen City Sand

Sparta Sand (Eocene) at surface, covers 25 % of this area

Sparta Sand

Weches Formation (Eocene) at surface, covers 13 % of this area

Weches Formation

Alluvium (Holocene) at surface, covers 6 % of this area

Alluvium

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

Reklaw Formation

Carizzo Sand (Eocene) at surface, covers 1 % of this area

Carizzo Sand

Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided (Paleocene and Eocene) at surface, covers 0.2 % of this area

Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.2 % of this area

Terrace deposits

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers < 0.1 % of this area

Wilcox Group, undivided