100 
FLORIDA GEOLOGICAL SURVEY. 
animal, vegetable and mineral productions of the 
Floridas and of the Indian tribes. 
Am. Jour. Sci. IX, 119-136, 1825. 
159. Porter, J. T.— 
Properties and Tests of Fuller’s Earth. 
U. S. Geol. Sur. Bull, 315, 268-290, 1907. 
160. Pratt, N. A.— 
Ashley River phosphates. History of the Marls 
of South Carolina, and of the discovery and devel¬ 
opment of the native bone phosphates of the 
Charleston Basin, 42 pp. Philadelphia, 1868.* 
161. Pratt, X. A.— 
Florida Phosphates. The origin of the bowlder 
phosphates of the Withlacoochee River district.* 
Eng. Min. Jour. LIII, 380, 1892. 
162. Pumpelly, Raphael— 
An Apparent Time-break between the Eocene and 
the Chattahoochee Miocene in Southwestern Geor¬ 
gia. 
Am. Jour. Sci. (3), XLVI, 445-447, 1893. 
163. Ries, Heinrich— 
The Clays of the United States East of the Mis¬ 
sissippi River. 
U. S. Geol. Sur. Prof. Paper, No. 11, 298 pp. 1903. 
The clay's of Florida are briefly described on pp. 81-86. 
164. Rogers, Henry Darwin— 
Oolite in Florida. 
Acad. Nat. Sci. Phila. Proc. II, 210-211, (1-8 p.) 
1846. 
The fossils contained in a specimen of oolite from 
Florida seemed to refer the formation to the latest Ter- 
tD**v. 
