120 FLORIDA STATE GEOLOGICAL SURVEY. 
and Clapp obtained collections from Eau Gallie, Titusville and 
Mims in Brevard County. It is probable that marine Pleistocene 
shell deposits are somewhat widely distributed along the coast 
and perhaps in the St. Johns River valley. Here, again, satisfac¬ 
tory determination can be made only from large and carefully * 
kept samples obtained in well drilling. The coquina rock which 
occurs extensively at St. Augustine and extends along the coast 
to the south for 250 miles is also to be placed with the Pleistocene. 
Some of the older sand dunes of the coast also probably belong 
to the Pleistocene. In southern Florida Pleistocene limestones 
are extensively developed in Palm Beach, Dade and Monroe 
Counties, bordering and underlying the Everglades and on the 
keys. 
The following is an analysis of a sample of the Miami Time- 
stone from near Miami, Florida. Analysis given by John B. 
Reilly. Name of analyst not recorded. 
Silica . 6.42 
Alumina and iron oxides . 0.94 
Carbonate of lime.... 91.23 
Carbonate of magnesium . 1.08 
99.67 
EARTH MOVEMENT DURING PLEISTOCENE. 
Changes in the relation of land and water have occurred re¬ 
cently along the East Coast, probably during Pleistocene time. 
The best evidence of these changes is that offered by the sand 
dunes and the coquina rock bordering the East Coast. The line 
of sand dunes along the coast is well developed and largely con¬ 
tinuous. From Daytona south these dunes occur, not on the 
present beach, but back from the beach a variable distance, de¬ 
pending upon the configuration of the country. At Daytona the 
sand dune lies back from .the Halifax River about two miles. 
From Daytona to Titusville the dunes are to be seen lying mostly 
to the west of the East Coast Railway at a distance of one or two 
miles from the coast. At Titusville the dunes lie back from the 
Indian River two to two and one-half miles. At Rockledge the 
