EASTERN AND SOUTHERN UNITED STATES. 
119 
Georgia line, and possibly much further. A slight unconformability has in some places 
been detected between the Miocene and the Eocene. In a paper entitled “ On the 
Relative Ages and Classification of the post-Eocene Tertiary Deposits of the Atlantic 
Slope ” * I have given what I considered to he good reasons for concluding that the 
Miocene deposits of North and South Carolina, my “Carolinian,” were of newer date 
than those of Virginia and Maryland, and that not improbably they represented the 
deposits of the lower^ (“ Black ”) Antwerp crag, the Diestian of the Belgian geologists, 
although the percentage of recent forms is considerably higher in this last than that 
which has been shown to be the case with the Carolinian fauna. The Virginia and 
Maryland deposits, on the other hand, and doubtless with these also those occurring 
in Delaware and New Jersey, represent approximately the “ Mediterranean ” (■erics of 
the Austrian geologists, and in their two divisions, the “ Marylandian” (or older deposits 
of Maryland, and probably also the lower bed in Virginia) and “ Virginian ” (as 
developed in the typical Miocene area of Virginia, and in the upper Maryland series) 
we have the correspondents, at least in part, of the “ First Mediterranean ” (and the 
faluns of Lcognan and Saucats), and the “Second Mediterranean” (and the laluns of 
Touraine) respectively. The southeast corner of Virginia, with the towns of Norfolk, 
Portsmouth, Suffolk, etc., appears to belong to the “ Carolinian ” horizon, or that of 
North and South Carolina. Comparing the Atlantic Miocene with deposits referred 
to the same age as occurring on some of the West Indies, Trinidad and San Domingo 
for example, we find that out of ten species of mollusca obtained from the Caroui beds 
of the first named island. Guppy identified no less than six as identical with forms 
found in the eastern United States : Petaloconchus sculpturatus, Dosinia acetabulum, 
Tellina Uplicafa, Pecten compariVs, Ostrea Virginica, and Teredo fistida.-\ ^ 'Ihis 
number is about equally distributed between the States of North and South Carolina 
and Virginia, and hence no absolute indication (by comparison) of the horizon is 
afforded by their presence. Petaloconclms scidptnratus. Teredo fistula and Telhna biph- 
cata are also found in the Miocene of San Domingo, and with them Chama ardndla 
and Area pe:rata,X but most of the sp icies occurring here are described as being distinct 
from North American forms. Further investigation, however, will doubtless reveal 
a greater number of identical forms. While, therefore, it is still impossible from 
paleontological data to establish a strict correlation between the Caribbean and Atlantic 
Aliocenes, yet probably we will not be fiir from the truth in assuming that the former 
^present a part of the Virginian or Marylandian series, seeing that the percentage of 
living forms in the contained fauna is only 20, or possibly stiU lower (8 or 9 according 
to Carrick Moore).§ They would, therefore, correspond to some part of the Medi- 
terranean ” as well. 
* Proc. Acad. Nat. Sciences of Phila., June, 1883. 
t Q. J. Geol. Soc., xxii, p. 576, 1866. 
t Guppy. Q- J- P' 
§ Guppy, op. cit, p. 575. 
