FREE INSTITUTE OF SCIENCE 



TERTIARY FAUNA OF FLORIDA 



1573 



JACKSONBORO' WHITE LIMESTONE. 



The limestone of the vicinity of Jacksonboro', Screven County, Georgia, 

 near the confluence of Brier Creek and Beaver Dam Creek, was originally dis- 

 cussed by Lyell and referred to the Eocene. In Bulletin 84 of the United States 

 Geological Survey the writer and Mr. Harris, on the basis of material collected 

 by Professor W. B. Clark, referred it to the vicinity of the Chipola and Tampa 

 horizons. The matter was still further complicated by the reception from 

 another source of some of this material, thus stated to be from the white 

 limestone of Claiborne Bluff, Alabama. Several species were described in the 

 early part of this work, as elsewhere noted (p. 1400), under this misappre- 

 hension. The locality was again visited by Mr. Vaughan in 1902 and more 

 material obtained, leaving no reasonable doubt that the Jacksonboro' horizon is 

 practically that of the Tampa limestone or Orbitolite bed of Florida. 



The following species have been obtained from this locality and are now 

 in the National Museum : 



Actaeon n. sp. 



Bulla petrosa Conrad, also Tampa. 



Bulla (etc.), three species. 



Pleurotoma sp. 



Drillia servata Conrad, also Chipola, etc. 



Drillia sp. 



Olivella sp. 



Marginella sp. 



Mitra n. sp. 



Cerithium georgianum Lyell and Sowerby, 



also Tampa. 



Cerithium platynema Dall, also Tampa. 

 Cerithium n. sp., also Tampa. 

 Pyrazisinus cornutus Heilprin, also Tampa. 

 Pyrazisinus, two new species. 

 Strombus albirupianus Dall. 

 Turritella tampre Heilprin, also Tampa. 

 Modulus turbinatus Heilprin, also Tampa. 

 Scala (Amsea) n. sp. 

 Calyptrsea trochiformis Lamarck, also 



Tampa. 

 Calyptrsea. 



Xenophora conchyliophora Born, also 



Tampa. 

 Amalthea sp. 

 Ampullina streptostoma Heilprin, also 



Tampa. 



Amauropsis ocalana Dall. 

 Fissuridea sp. 



Dentalium mississippiensis Conrad. 

 Modiolus sp. 



Lithophaga nuda Dall, also Tampa. 

 Mytilus sp. 

 Pecten n. sp. ?. 



Cardium virile Dall, var., also Chipola. 

 Chama Lyelli Dall. 

 Phacoides, two species. 

 Tellina merula Dall, also Tampa. 

 Tellina sp. 



Macoma, two species. 

 Psammosolen sp. 

 Fistulana ocalana Dall. 



Orbitoides n. sp. 



