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Geologic units in Hidalgo county, Texas

Additional scientific data in this geographic area

Goliad Formation (Miocene) at surface, covers 36 % of this area

Goliad Formation

Sand sheet deposits (Holocene) at surface, covers 18 % of this area

Sand sheet deposits

Dune sand sheet deposits (Holocene) at surface, covers 13 % of this area

Dune sand sheet deposits

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 9 % of this area

Lissie Formation

Alluvium in Rio Grande, subdivided into areas predominantly of sand (Quaternary; Holocene) at surface, covers 8 % of this area

Alluvium in Rio Grande, subdivided into areas predominantly of sand

Alluvium in Rio Grande, subdivided into areas predominantly of clay (Quaternary; Holocene) at surface, covers 6 % of this area

Alluvium in Rio Grande, subdivided into areas predominantly of clay

Beaumont Formation, areas predominantly clay (Quaternary; Late Pleistocene) at surface, covers 4 % of this area

Beaumont Formation, areas predominantly clay

In Rio Grande delta area, clay veneer over meanderbelt sand (Quaternary) at surface, covers 3 % of this area

In Rio Grande delta area, clay veneer over meanderbelt sand

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 0.4 % of this area

Beaumont Formation, areas predominantly sand

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.3 % of this area

Terrace deposits

Clay dune (Holocene) at surface, covers 0.2 % of this area

Clay dune

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Alluvium