Structural Control on Cave Development in Cretaceous Limestone, Southern Puerto Rico
Miller, Thomas E.
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Surveys of Sistema Los Chorros (815m length) and Sistema Vientos (600 m) represent the first cave maps from southern Puerto Rico published in the last quarter century. These are the largest caves known in that area. They have developed at about 100m asl in resistant Cretaceous limestones and display structural control dominated by strike and dip (35-60 °), as well as faults and clastic dikes. In profile they display 2-4 vertically- separated levels with slopes of 30-60 m/km, all greater than those of neighboring surface streams, and indicate relative groundwater lowering of 40-60 meters.