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On Grand Cayman, exposures of dolostones belonging to the Cayman Formation (Miocene) represent an erosional unconformity that has been developing since the late Pliocene (~3.6Ma). Sinkholes that developed during this time have remained open or become partly to fully filled with various combinations of rootcrete, breccias, loose limestone and dolostone lithoclasts, and white, red and orange limestones...
On Grand Cayman and Cayman Brac, karst development on the upper surface of the Cayman Formation during the late Miocene lowstand produced the Cayman Unconformity. On Grand Cayman, this led to the development of a deep, atoll-shaped depression on the western part of the island. The ensuing Lower Pliocene transgression buried that unconformity and led to deposition of sediments that now form the Pedro...
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