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This generalized diagram of an east-west cross section of the Edwards Aquifer

region extends from Brackettville, in Kinney County, east, towards Kyle, in Hays

County. The Aquifer is illustrated in the confined zone (Artesian Zone) by the

relatively less permeable rocks above and below the Edwards Limestone.

The vertical lines represent some of the many seismic faults of the Balcones

Fault Zone. The faults formed approximately 18 million years ago causing

significant displacement within the Edwards Limestone.

Brackettville

Edwards Aquifer Regional Cross-Section