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Geologic units in Duval county, Texas

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.8 % of this area
sand, silt, clay, and gravel. locally indurated with calcium carbonate (caliche); includes point bar, natural levee, stream channel, sand dune, terrace, alluvial fan, landslide bolson and playa deposits
Lithology: sand ; silt ; clay or mud; gravel; carbonate
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 5 % of this area
sand sheet deposits
Lithology: sand; silt
Jackson Group, undivided (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 0.9 % of this area
Jackson Group, undivided
Lithology: clay or mud; sandstone; siltstone
Frio Clay (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 3 % of this area
Frio Clay
Lithology: clay or mud
Fleming Formation and Oakville Sandstone, undivided (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 12 % of this area
Fleming Formation and Oakville Sandstone, undivided
Lithology: clay or mud; sandstone
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.9 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
Goliad Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 56 % of this area
Goliad Formation
Lithology: clay or mud; sandstone; mudstone; carbonate; limestone; conglomerate
Catahoula Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 13 % of this area
Catahoula Formation
Lithology: mudstone; sand; tuff; sandstone; conglomerate
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 4 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers 4 % of this area
Lissie Formation
Lithology: sand; silt; clay or mud

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