18 FLORIDA GEOLOGICAL SURVEY—FOURTH ANNUAL REPORT. 
on the east coast at Ft. Lauderdale, Eau Gallie, Titusville and 
Mims, and at Kissimmee, in the central part of the peninsula, at a 
depth of 100 feet. Fresh water Pleistocene deposits containing often 
the remains of vertebrates, are found locally throughout the interior 
of the State. 
In addition to the local Pleistocene deposits already mentioned 
several well defined marine formations of this age have been differ¬ 
entiated in southern Florida. These have been fully described in 
the Second Annual Report of the Survey by Mr. Samuel Sanford. 
The best known of these marine Pleistocene formations is the Miami 
Limestone. This formation is well exposed in the vicinity of Miami 
and generally along the eastern border of the Everglades from some 
miles north of Ft. Lauderdale to Homestead. It consists of a light 
colored oolitic limestone in which is included a small amount of 
sand. The limestone at Miami is quarried and used as a building 
stone. As is frequently the case with limestones, the rock when 
first uncovered is soft and can be easily worked, but hardens upon 
exposure, due to the deposition of calcium carbonate upon the evap¬ 
oration of the water held in the interstices of the rock. A similar 
limestone at Key West is designated by Sanford as the Key West 
Limestone, although this may possibly be the southward extent of 
the Miami Limestone. 
Another limestone is found along the keys from Key Largo to 
Knights Key. This is a coralline limestone and is of interest as 
being the only true coralline limestone in Florida. It is designated 
the Key Largo Limestone. 
The term Anastasia formation is applied to the extensive deposit 
of coquina rock found along the East Coast. This formation is typi¬ 
cally exposed on Anastasia Island opposite St. Augustine, and ex¬ 
tends along the coast south from this point a distance of 150 miles 
or more. The coquina rock has been frequently described both in 
the reports of this Survey and elsewhere. It is made up of a mass 
of more or less water-worn shells, which in some localities are 
cemented to form a firm rock, but elsewhere may be slightly or not 
at all cemented. Some sand is frequently included in this forma¬ 
tion and the cementing material is calcareous. Aside from the type 
exposure on Anastasia Island, the cut made by the Florida East 
Coast Railway on Tomora Creek near Ormond, and the exposure 
along the coast at Rock!edge may be mentioned. 
The Anastasia formation is probably contemporaneous or partly 
so with the Miami Limestone and the other Pleistocene limestones 
along the southern coast, all of these having been formed previous 
