92 
FLORIDA GEOLOGICAL SURVEY. 
115. Langdon, Daniel, W., Jr.— 
Some Florida Miocene. 
Am. Jour. Sci. (3) XXXVIII, 322-324, 1889. 
Proposed the “Chattahoochee Group” for limestone 
along the Chattahoochee. 
116. Langdon, Daniel W., Jr.— 
Geology of the Coastal Plain of Alabama. 
Geol. Sur. Ala., 1894. 
The description of Florida formations occurs on pp. 
373-376. 
117. LeConte, John— 
On the Optical Phenomena presented by the “Sil¬ 
ver-Spring,” in Marion County, Florida. 
Am. Jour. Sci. (2), XXXI, 1-12, 1861. 
118. LeConte, Joseph— 
On the Agency of the Gulf-Stream in the Forma¬ 
tion of the Peninsula of Florida. 
Am. Assoc. Adv. Sci. Proc., pt. 2, 103-119, 1857. 
119. LeConte, Joseph— 
The Reefs, Keys, and Peninsula of Florida. 
Science, II, 764, 1883. 
Recognizes that the substructure of the keys is not due 
to the Gulf Stream and that the process of coral formation 
of the peninsula can not have commenced north of the 
north line of the Everglades. 
120. Ledoux, Albert R.— 
The Newly-discovered Phosphate-beds of Florida. 
New York Acad. Sci. Trans. IX, 84-94, 1890; 
Eng. Min. Jour. XLIX, 175-177, 1890; Sci. Am. 
Supp. XXX, 12104-12105, No. 758, 1890. 
