u 
-VL SURVEY. 
istence of this return eddy accounts also for the gradual 
extension of the keys to the west. 
In 1865 T. A. Conrad identified three species of inver¬ 
tebrates from the Ocala Limestone. These were found to 
be Eocene species of California, Maryland and New 
Jersey. Conrad refers the Ocala rock to the period of 
the Shark River marl of New Jersey. This paper, (31), 
like the one by Professor John LeConte, is of interest as 
identifying the limestone of Florida as Eocene, notwith¬ 
standing the papers of earlier date by Agassiz and Joseph 
LeConte, both of which writers regarded the deposits of 
the State as of comparatively recent date. 
A paper published in 1881 by Professor Eugene A. 
Smith (186) is of great importance as being the first 
paper to correct the erroneous views regarding the coral 
formation of Florida. The underlying limestone of the 
interior of Florida was identified by him; as the Vicksburg 
Limestone, and was traced by actual outcroppings from 
Jackson County in west Florida, through middle Florida 
to Marion County, in south-central Florida. From his own 
observations and from observations of others, Smith was 
brought to the conclusion (p. 298) : 
“That almost the whole of the State of Florida, from the 
Perdido River of the west, ea r Iward and southward, including 
the middle and western parts of the peninsula certainly as far 
south as the latitude of Tampa Bay, and probably as far as 
the latitude of Charlotte Plarbor, has for its underlying forma¬ 
tion the White or Orbitoides limestone of Vicksburg age.” 
It is now known that the supposed southward extent 
•f the Vicksburg, based principally on the observations of 
others, was much too great. The essential facts remain, 
however, that Smith correctly identified the Vicksburg 
limestone as the foundation rock of the interior of cen¬ 
tral Florida. Smith records; in this paper for the first 
time the presence of Miocene deposits in Florida, an ex¬ 
posure having been examined by him at Rock Springs in 
Ornngp County. 
