SECOND ANNUAL REPORT—STRATIGRAPHIC GEOLOGY. 
65 
penetrated a short distance. Mr. Clapp reports that nummulites occur 
down to the base of this exposure, but are not so numerous as at some 
of the other localities. Lithologically this rock is essentially the same 
as that exposed at the quarry of the Ocala Limestone Company, and 
the section shows the maximum observed thickness of the formation. 
At the old “Phillips” quarry, one mile southeast of Ocala, there is 
a section which shows about twenty-five feet of soft, porous, light- 
gray limestone which contains an abundance of chert throughout the 
entire section. Since this rock contains many nummulites, its identi¬ 
fication as the Ocala limestone can scarely be questioned. Solution 
cavities are common and along certain vertical crevices the rock has 
been removed, forming passages two or three feet in width. These 
have been filled by the settling of the overlying sandy clay. 
On the Anclote River, about one mile from Tarpon Springs, there 
is an exposure showing from two to three feet of nummulitic limestone 
which extends some distance up the stream. The rock here lies near 
the surface over a considerable area and boulders containing num¬ 
mulites are common. A similar exposure of Ocala limestone was 
noted near Port Richey on the Pithlachascotee River where the rock 
is said to outcrop over a considerable area. At the mine of the Fort 
White Hard Rock Company, one-half mile southwest of Fort White, 
the Ocala limestone is well exposed. In the north pit belonging to 
this company, the following section was observed: 
Light-gray sandy loam, Pleistocene . 4-8 ft. 
Fine, even-grained, yellow sand, residual.. _.. 20 ft. 
Limestone and phosphate rock, Ocala limestone. 25-30 ft. 
In this pit the Ocala limestone occurs in irregular ledges separat¬ 
ing the phosphate rock which appears to be in part the result of re¬ 
placement of the country rock. The limestone ledges commonly form 
two discontinuous series at approximately right angles to each other, 
the intervening space being occupied by the irregular bodies of phos¬ 
phate rock. In general, the limestone bands thicken toward the base 
of the pit, and the phosphate deposits become smaller. Both the lime¬ 
stone and phosphate are more or less cherty, but the silicification ap¬ 
pears to be in the form of nodules and small boulders rather than ex¬ 
tensive replacement. Fossils are very abundant in the limestone, 
prominent among them being the characteristic Nummulites of this 
formation. At the mine of the Cummer Lumber Company, four.miles 
west of High Springs, there is a similar exposure of the Ocala lime¬ 
stone. At this locality the rock lies much nearer the surface, the total 
thickness of overlying sand being seldom greater than ten feet. There 
is the same characteristic arrangement of the limestone and phosphate 
rock as at Fort White. 
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