PEBBLE PHOSPHATE DEPOSITS. 
49 
there are also some pieces of a white limestone consisting chiefly of broken 
fragments. With this are some dark colored pieces which probably scaled off 
of the side of the cavity. A small flat echinoderm is present. 
Description of samples from well No. 3 of the Palmetto Phosphate Com¬ 
pany, near pit No. 1 about 2^4 miles northwest of Tiger Bay. 
Depth of sample from the surface. 
8 to 16 feet. The material from this depth represents the Bone Valley for¬ 
mation. 
30 to 40 feet. Yellow sandy and clayey phosphatic marl. The phosphate is 
chiefly in the form of smooth rounded light or dark pebbles. Smooth silic¬ 
eous pebbles are also present. This material represents the “bed rock,” 
which is the Alum Bluff formation. 
40 to 50 feet. Light colored marl with some bluish calcareous clays and pebble 
phosphate. 
50 to 60 feet. Gray phosphatic sandy marl. 
60 to 90 feet. Light colored limestone, including some phosphate pebbles and 
broken pieces of chert. 
90 to 105 feet. Light colored limestone, light and dark phosphate pebbles and 
broken pieces of chert. 
115 to 125 feet. Phophate pebbles and pieces of broken chert, and light coh¬ 
ered limestone. 
141 feet. A rather hard light brown limestone, including phosphate pebbles and 
some light colored limestone and broken pieces of chert. 
t 
143 feet. Porous limestone and marl with an abundance of black phosphate 
pebbles. 
160 feet. Light colored porous limestone or marl with black phosphate pebbles, 
170 to 190 feet. Rather hard brownish limestone, with some phosphate pebbles 
and occasional casts of shells. 
200 to 210 feet. Rather hard, light colored or gray sandy phosphatic limestone. 
The phosphate is chiefly in the form of minute black pebbles. 
218 to 223 feet. Slightly greenish sandy phosphatic and calcareous clays. This 
clay is much like a part of the sample obtained from well No. 3 at 255 to 
260 feet. 
223 to 226 feet. Light colored or gray phosphatic limestone or marl very simi¬ 
lar to the rock at 210 feet. 
226 to 252 feet. Slight greenish sandy phosphatic clay, much like that at 218 
to 223 feet. 
253 to 260 feet. The material at this depth consists chiefly of a greenish, very 
sandy phosphatic marl. The fossils observed include several sharks’ teeth 
and casts of shells. Also teeth of the ray. In addition to the greenish marl, 
is found some light colored limestone or marl containing casts of shells. 
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