FOSSILS FROM THE LAND PEBBLE PHOSPHATE DE¬ 
POSITS. 
SHARKS. 
Fig. 26.—Sharks’ teeth from the Bone Valley formation. Hemipristis above, 
and Carcharias below. Natural size. Fla. Geol. Surv. collection Nos. 825-e and 
261-a. 
Fig. 27.—A large phosphate pebble from the pit of the Pierce Phosphate 
Company, Pierce. Something of the structure of the pebble may be seen in the 
photograph. It is made up of sand grains, minute phosphate pebbles and cast 
of shells imbedded in the phosphatic matrix. 
Fig. 28.—Sharks’ teeth from the Bone Valley formation. Carcharodon above 
and Galeocerdo below. Natural size. Fla. Geol. Surv. collection Nos. 2305-a, 
2561, 825-a, 825-b, 825-c. 
Shark and ray teeth are very abundant in the Bone Valley f orma¬ 
tion. Some of these without doubt were derived from the Alum 
Bluff formation beneath, while others perhaps, represent sharks and 
rays that were living at the time the Bone Valley formation was ac¬ 
cumulated. 
98 
