Geologic units in Shelby county, Texas

Weches Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.1 % of this area: Weches Formation
Lithology: sand; clay or mud
Reklaw Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 1.0 % of this area: Reklaw Formation
Lithology: sandstone; clay or mud
Queen City Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.7 % of this area: Queen City Sand
Lithology: sandstone; siltstone; clay or mud; sand
Sparta Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area: Sparta Sand
Lithology: sand; clay or mud; silt; sandstone; coal
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 3 % of this area: Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 10 % of this area: alluvium
Lithology: sand; silt; clay or mud; gravel
Wilcox Group, undivided (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers 74 % of this area: Wilcox Group, undivided
Lithology: fine-grained mixed clastic; coal; sand; clay or mud
Carizzo Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 6 % of this area: Carizzo Sand
Lithology: sandstone