Shaded Areas: Outcrop (That Part of a water bearing rock layer which appears at the land surface) Ruled Areas: Downdip (That Part of a water bearing rock layer which dips below other rock layers) Source: Texas Water Development Board

1. Ogallala Aquifer
2. Seymour
3. Hueco-Mesilla Bolson
4.Cenozoic Pecos Alluvium
5. Edwards-Trinity
6. Trinity
7. Edwards (BFZ)
8. Carrizo-Wilcox
9.Gulf Coast

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