EASTERN AND SOUTHERN UNITED STATES. 
117 
member of the typical European Eocene, as developed in the British and Paris basins, 
and underlying what can, I believe, be proved to be true Oligocene deposits, it may 
be reasonably inferred that they represent what in the basins referred to constitute the 
uppermost member of the entire series — the sands of Beauchamp and the Barton clay 
( = Upper Bagshot sands 1). Confirmation of this view is afforded by the discovery 
in the Barton clay of Hampshire of the remains of a Zeuglodon {Z. WanMyni, 
Seeley),* the only individual of the genus that has hitherto been found in any 
European formation. No really satisfactory evidence as yet exists as to the occurrence 
of Zeuglodon in any American formation but the “Jacksonian.” 
The so-called Oligocene deposits, to which reference has just been made, occupy 
in Alabama, Mississippi and Louisiana a narrow band of territory immediately to the 
south of, and bordering the “.Jacksonian,” which, as already stated, they also overlie. 
They occupy the greater portion of Florida, and doubtless also have a considerable 
development in southern Georgia and southeastern Texas, but in these last two States 
their areas have not as yet been accurately determined. They were originally called 
by Conrad, who first characterized them, the A^icksburg beds, and by me have been 
designated the “ Orbitoitic,” from the great abundance of Orhitoides Mantelli, their 
most distinctive fossil. Conrad referred the deposits in question to the Oligocene age 
not because they contained fossils in any way indicative of deposits of the same age in 
other countries, but merely for the reason that their contained fossils, as he supposed, 
were almost entirely distinct from those of the subjacent Eocene deposits, and equally 
distinct from those characteristic of the formations which he correctly surmised to be 
of newer date — the Atlantic Miocenes. This inference, I believe, can now much 
more satisfactorily be shown to be true. The Oi'bitoides Mant'-lli occurs in very 
considerable abundance in several of the AVest India Islands — Jamaica, Antigua, 
Trinidad— where the beds containing them are doubtless of equivalent age, and of the 
same age as the orbitoitic beds of Florida, and other 'of the southern States.f In the 
island of I'rinidad they enter largely into the composition of the San Fernando rocks, 
which are by Guppy considered to represent the base of the Tertiary series of the 
islands, and which, together with the Chert formation in Antigua and the Anguilla 
beds, constitute a portion of his lower West Indian Miocene (m distinction to the 
principal Tertiary deposits of the island of Jamaica, the middle Tertiaries of San 
Domingo and Cuba, those of Cumana, and the Caroni beds of Trinidad, which 
together form the upper or later part of the West Indian AIiocene).J Ihese San 
Fernando beds have been more recently correlated by Duncan with the deposits 
occurjing on the island of St. Bartholomew, which are emphaticaUy stated to be of pre- 
Aliocene age, and where no Miocene deposits have thus far been discovered to exist.§ 
fB"i;oTu:;d"n1Ld.a„c^ m the lower limestone deposits of the island of Malta (T. R. .Tones), 
16 JOUR. A. N. S. PHILA., VOL. IX. 
