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Legend (GeoHub/USGSPrincipalAquifers)

Principal Aquifers (0)
Colorado Plateaus aquifers Colorado Plateaus aquifers
High Plains aquifer High Plains aquifer
Lower Cretaceous aquifers Lower Cretaceous aquifers
Lower Tertiary aquifers Lower Tertiary aquifers
Northern Rocky Mountains Intermontane Basins aquifer system Northern Rocky Mountains Intermontane Basins aquifer system
Other rocks Other rocks
Pacific Northwest basaltic-rock aquifers Pacific Northwest basaltic-rock aquifers
Pacific Northwest basin-fill aquifers Pacific Northwest basin-fill aquifers
Paleozoic aquifers Paleozoic aquifers
Upper Cretaceous aquifers Upper Cretaceous aquifers
Upper Tertiary aquifers Upper Tertiary aquifers