50 
FLORIDA GEOLOGICAL SURVEY—SEVENTH ANNUAL REPORT. 
275 to 290 feet. This sample consists in part of greenish sandy phosphatic marl 
similar to that at 253 and 260 feet, containing teeth of sharks and rays. The 
sample also includes a light colored nearly white limestone, containing small 
shells, bryozoa and spines of echinoderms. 
300 to 320 feet. Light colored or white granular limestone including broken 
shells, spines of echinoderms, bryozoa and other fossils. 
330 feet. Hard brownish limestone powdered fine in drilling. 
337 and 350 feet. Light colored or white granular porous limestone, shells pre¬ 
served as broken fragments. 
360 to 530 feet. Ocala limestone consisting of a mass of broken shells, among 
which Orbitoides predominates. 
540 to 560 feet. Ocala limestone in which Nummiilites as well as Orbitoides are 
abundant. 
570 and 580 feet. Echinoderm horizon, the samples consisting almost wholly 
of a small echinoderm. 
590 feet. Rather hard limestone with brownish cast. Nummulites and Orbitoi- ' 
des present although not abundant. 
600 feet. This sample, like those at 570 and 580 feet, consists of a mass of 
small^ echinoderms. 
620 to 660 feet. The samples throughout this interval consist chiefly of a hard 
limestone of brownish color which is powdered fine by the drill. 
670 feet. This sample consists largely of very small brownish calcite crystals. 
After the well had been completed and allowed to stand for some time, 
8 to 10 bushels of this material was pumped from the well, having been 
carried into the well from the cavity in the rock. 
680 to 740 feet. The samples throughout this interval are from a hard lime¬ 
stone, brownish in color, which as a rule is powdered rather fine by the drill. 
750 and 770 feet. Small calcite crystals which were pumped from cavities. 
Description of samples from the well of the Phosphate Mining Company. 
Well located at Christina, Florida. Depth of well 800 feet. 
Depth of sample from the surface. 
100 feet. The rock at this depth consists of sand with slightly greenish tinge 
together with fragments of a light colored marl containing small black 
phosphate pebbles. 
120 to 300 feet. Samples at twenty-foot intervals. The rock throughout this 
depth is a light colored limestone having an appearance of a mass of broken 
fragments. 
320 to 460 feet, samples at twenty-foot intervals. The rock throughout this 
interval is a light colored limestone containing an abundance of foramin- 
ifera. 
480 and 520 feet. Light colored granular limestone. 
