4 6 FLORIDA GEOLOGICAL SURVEY-SEVENTH ANNUAL REPORT. 
190 feet. This sample includes compact phosphatic limestone with about equal 
admixture of pure white siliceous sand. Whether the sand is from a sand 
stratum or from the six-inch cavity found at this depth, or possibly acci¬ 
dentally mixed from the surface, is not known. 
195 feet. A sandy, calcareous and phosphatic clay. In water this material falls 
to pieces and becomes slippery. In acid it effervesces. The sand is in the 
form of clear grained silica. The phosphate is mostly in the form of small 
black pebbles. Material is light colored when dry, although slightly bluish 
when wet. 
200 feet. This material is similar to that at 195 feet although there is perhaps 
less phosphate, and the sand is perhaps smaller grained. 
205 feet. A gray sandy phosphatic limestone. The calcareous material seems 
to predominate, although the rock is rather sandy. The sand grains are 
small and well rounded. The phosphate is in the form of very minute dark 
specks and the rock possibly also has a phosphatic cement. No fossils seen. 
240 feet. A gray sandy phosphatic limestone. The calcareous material seems 
to predominate although the rock is rather sandy, the sand grains are small 
and well rounded. The phosphate is in the form of very minute dark specks 
and the rock possibly also has a phosphatic cement. No fossils seen in this 
material, except some imperfect casts in fragments of a porous limestone 
which may have fallen down from a higher stratum. These porous pieces 
occur also in the sample at 205 feet. 
250 feet. Light colored sandy and phosphatic limestone. The sand grains are 
clear silica. The phosphate pebbles are dark colored. A few fragments 
of casts of fossils. This rock is not materially different from that at 205 
and 240 feet except that it is lighter in color. 
255 feet. Bluish gray, sandy, phosphatic limestone together with loose calcar¬ 
eous sand probably representing the ground-up rock. No fossils seen ex¬ 
cept echinoderm spines. 
255 to 260 feet. Gray or blue calcareous sandy phosphatic clay. No fossils. 
This material is similar to that at 200 feet. 
265 feet. Bluish gray sandy phosphatic limestone together with loose calcar¬ 
eous sand probably representing the ground-up rock. No fossils seen except 
echinoderm spines. 
272 feet. Light colored sandy phosphatic limestone. This is very similar to 
the rock above the blue clay. A few fossils including fragments of Pecten. 
Also one flattened water-worn pebble of the same material as the rock above. 
275 feet. The greater part of the material of this sample is the bluish gray 
sandy phosphatic limestone similar to that already described. With this is 
found a light colored compact limestone, very slightly phosphatic as shown 
by test. The sample also contains several pieces of red iron ore. Of fossils 
only a few fragments were seen. 
320 feet. Light colored phosphatic and slightly sandy marl or limestone. The 
phosphate is in the form of smooth dark pebbles imbedded in the marl. 
The rock is fossiliferous, although the fossils are badly broken. 
