52 



Richard Franz, Judy Bauer and Tom Morris 



Fig. 2. Distributions of the six regional faunas. Dots indicate the 

 position of biologically significant caves in Florida (see Appendix 1). 



shell bed and a fine- to medium-grained dolomitic calcarenite that 

 appears to be related to the Jackson Bluff group of marine sedi- 

 ments, probably Miocene in age (Muriel Hunter, personal communi- 

 cation, Tallahassee, Florida). Cooke (1945) considered the shell layer 

 to represent the "Cancellaria Zone" in the Duplin marl which overlies 

 a "cavernous limestone" in the Shoal River Formation. These spring 

 caves lie close enough to the surface that they are breached by 

 numerous small conical sinks in the adjoining upland. Available 

 samples of the Econfina Creek Fauna were obtained from a small, 

 permanently flowing cave stream at the base of one of these sink- 

 holes behind the most westerly spring outlet. 



