PEBBLE PHOSPHATE DEPOSITS. 
47 
350 feet. Light colored phosphatic marl or limestone more or less sandy. One 
small fragment of chalcedony holding cast of shell. A few fossils mostly 
broken bivalves and gastropods. The sample includes some bluish gray 
sandy phosphatic limestone. 
360 feet. Light colored phosphatic sandy marl, also some bluish gray sandy 
phosphatic marl or limestone. Some broken fossils are included. 
400 feet. Light colored, finely powdered marl or limestone. Fragments of 
echinoderm spines are present and other small or broken fossils. A few 
phosphatic pebbles are seen, being black and shiny in appearance. A clear 
grained quartz sand occurs sparingly. This material is less phosphatic than 
that which lies above and resembles the Chattahoochee limestone as seen 
at Newland Spring near Falmouth in Suwannee County and near Bass in 
Columbia County. Test showed this powdered material to contain a small 
amount of phosphate. 
410 feet. Light colored finely powdered marl or limestone. Fragments of echin¬ 
oderm spines are seen, and also other small fossils including a few bryozoa. 
This material is similar to that at 400 feet, although tlmre seem to be no 
phosphatic pebbles and little if any sand. 
420 feet. Light colored, nearly white limestone not so finely powdered as the 
preceding two samples. Fragments of broken shells are abundant. Bryozoa 
are numerous. Some foraminifera are present, the most: Common being 
Orbito'des. This limestone is with little doubt the Ocala. Te»t shows it to be 
not phosphatic. 
450 feet. The limestone at this depth is practically the same as that at 420 
feet. It is light colored or nearly white, fragments of broken shell are 
abundant, among which Pecten is recognized. Small foraminifera are nu¬ 
merous, and there are also broken pieces of larger specimens. Bryozoa are 
present. 
500 feet. Foraminifera abundant, chiefly Orbitoides, including large specimens, 
most of which are broken by the drill. 
550 feet. Foraminifera abundant. The material is similar to that at 500 feet. 
600 feet. At this depth foraminifera are abundant. The predominating .form is 
Nummulites. Orbitoides present but not abundant. The sample includes also 
sbme pieces of a soft, granular white marl. 
630 feet. Limestone, probably hard and compact, the sample being finely pow¬ 
dered by the drill. Both Nummulites and Orbitoides are present, although 
only the small specimens escaped being powdered by the drill. This com¬ 
pact limestone has a slightly brownish cast. 
636 feet. Hard compact limestone with brownish cast powdered exceedingly fine 
by the drill. Few fossils escaped being powdered up, although some fora¬ 
minifera and bryozoa are present. 
650 feet. This sample shows a mixture of finely powdered material with brown¬ 
ish cast together with coarser material from a softer rock. With the coarser 
material is included some small pieces of bluish colored chert. Foraminifera 
are present. 
