Onac, Bogdan Petroniu, Department of Geology, University of South Florida, 4202 E. Fowler Ave. SCA 528, Tampa, 33620, United States; Department of Geology & “Babeş-Bolyai” University, Kogălniceanu 1, 400084, Cluj Napoca, Romania; “Emil Racoviţă” Institute of Speleology, Clinicilor 5, Cluj Napoca, 400006, Romania, United States