182 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
same relative position above folded terrigenous formations as in Bar- 
bados and Jamaica. These beds, variously called San Fernando and 
Naparima by Guppy, contain the characteristic @lobigerin, Orbitoides, 
and Nummuline of the Cambridge and Montpelier beds of Jamaica, and 
in Guppy’s latest papers are referred by him to the Eocene,! although 
for many years he placed them in the Miocene. The position of the 
white Radiolarian marls above a great series of clays and sandstones 
resembling the Scotland rocks of Barbados (Richmond beds of Jamaica) 
has been later confirmed by the observations of Harrison.? 
Extensive deposits of Radiolarian earths occur nowhere, so far as we 
are aware, adjacent to the eastern side of the American continent. The 
occurrence of these apparently synchronous oceanic beds in the widely 
separated West Indian localities of the Antilles, Trinidad, and Barbados, 
indicate deep water conditions in each of the regions. 
The Vicksburg-Jackson formation of the Gulf States Tertiary is in 
my opinion synchronous with that of the oceanic beds of the Montpelier 
epoch of the Antillean region, and are probably the northern shallow 
attenuation of the oceanic beds of the West Indies. They are charac- 
terized by the species Orbitoides mantelli, and in Florida Vummuline 
also occur. Although composed largely of oceanic material they are 
shallower beds than the Antillean formations. The visible effect of 
the Antillean subsidence reflected in the sediments of the Tertiaries of our 
southern coast was to change their character from the non-calcareous 
nature observable in the Claiborne to more calcareous deposits of the 
Jackson and Vicksburg beds. In Alabama and Mississippi the Vicks- 
burg beds, with the overlying Jackson, are white limestones, the 
combined thickness aggregating about 500 feet. In Florida the 
Vicksburg beds outcrop in the northern portion of the State. Be- 
neath the Pliocene coating of Southern Florida the Vicksburg beds, 
as exposed by well drillings, have a thickness of 200 feet, and contain 
the characteristic Orbitoides and Nummuline. Their microscopic nature 
has not been investigated. These beds are characterized by the three 
genera of Foraminifera, Orbitoides mantelli (the Orbitoides liméstone °), 
Nummuline,* and Milolide,® which are so abundant in the lower part of 
the Montpelier of Jamaica and Southern Mexico. 
1 Quart. Jour. Geol. Soc. London, 1892, Vol. XL VIII. pp. 51? -524. 
2 Quart. Jour. Geol. Soc. London, 1892, Vol. XLVIII. p. 218. 
8 Dall, Bull. 84, U. S. Geological Survey, page 101. 
4 Heilprin, cited by Dall, Bull. 84, U. S. Geological Survey, pages 103, 104, 
5 Ibid., p. 104, 
