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The Edwards Aquifer is found in association with the Balcones Escarpment in central Texas. The Balcones Escarpment and Fault Zone is the dominant structural feature in the area, and the major faults occur as a series of closely spaced step faults that trend eastward in Kinney County to Bexar County area then northeastward from Bexar County to Hays County. The Edwards Aquifer is a porous, honeycombed, cavernous limestone that consists of fine grained carbonate rocks between the base of the Del Rio Clay and the top of the Glen Rose Formation. The thickness of the porous beds of Edwards limestone varies between 122 and 152 m (Puente, 1976). The aquifer is about 282 km long, from 8 to 64 km wide, and has two major features: the recharge area and the artesian area (Fig. I). The water entering the aquifer moves first southward from the Edwards Plateau then eastward and northeastward toward large natural outlets at Comal Springs in New Braunfels and San Marcos Springs in San Marcos. Other discharges from the aquifer are Leona Springs in Uvalde, San Antonio and San Pedro Springs in San Antonio, and Hueco Springs north of New Braunfels. An illustration of the possible structure of the cavernous Edwards is given in Figure 2. This indicates the possible relationship between flow and the top of the piezometric surface (Arnow, 1959). Many wells have been drilled into the artesian part of the aquifer, and many of them in the San Antonio area f10wat ground level. The fauna occurring in the aquifer, springs, and flowing artesian wells were sampled during the studies. In a few instances, pumped wells were sampled. Recharge averages more than 616 hm3 (cubic hectometers). The total amount of water stored in the aquifer is not known. During the period 1934

The Edwards Aquifer: Earth's most diverse groundwater ecosystem?