198 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



CONCLUDING REMARKS ON THE EOCENE. 



From the foregoing discussion it is clear that marine upper Eocene 

 formations are widely distributed in the southern United States, the 

 West Indies, Central America, and northern South America, and 

 that the Atlantic and Pacific Oceans were connected at that time. 

 One of the areas in which there was such a connection was across 

 the present site of eastern Nicaragua. 



Haug, I believe, correctly correlated the Jackson of Mississippi 

 and other Gulf States with the Bartonian-Ludian (Priabonian) of 

 Europe. 1 



Attention should be directed to a statement by Oppenheim 2 in 

 which he suggests that the St. Bartholomew coral-fauna might be 

 the equivalent of the Priabona formation. The sequence I am 

 giving three of the important American horizons precisely paral- 

 lels Oppenheim's order, as expressed on page 13 of his work cited. 

 It is as follows: 



Oligocene : 



Middle (Stampian = Rupelian = Antiguan) . 

 Lower (Sannoisian = Lattorfian = Vicksburgian) . 



Eocene: 



Upper (Priabonian = Ludian = Jacksonian == horizon of St. 

 Bartholomew limestone, etc.). 



Oligocene. 



LOWER OLIGOCENE. 



The lower Oligocene corals of the United States have been de- 

 scribed by me. 3 



Dr. C. W. Cooke, in a paper recently published, subdivides the 

 Vicksburg group in Mississippi, Alabama, and Florida as follows: 



Subdivisions of the Vicksburg group in Mississippi, Alabama, and Florida. 



2s 



Mississippi. 



Alabama. 

 Bryam calcareous marl. 



Glendon limestone member. 



Mint Spring 



calcareous marl 



member. 



"Chimney Rock" facies 



Forest Hill sand 

 (Western Mississippi). 



Red Bluff clay 

 (Eastern Mississippi). 



Florida. 



1 Haug, Emile, Traite de geolegie, vol. 2, p. 1523, 1911. 



2 Oppenheim, P., Die Priabonaschichten und ihre Fauna, Palacontographica, vol. 47, pp. 348, 21 pis, 

 1901. 



3 Vaughan, T. W., The Eocene and lower Oligocene coral faunas of the United States, U. S. Geol. Survey 

 Mon. 39, pp. 263, pis. 24, 1900. See especially p. 30. 



