144 
FLORIDA STATE GEOLOGICAL SURVEY. 
Lafayette formation is a difficult task because of the uncertainty which 
frequently attends the identification and correlation of exposures of the 
formation. While the number of sections given below is limited, they 
are believed to be fairly representative of the formation as it is devel¬ 
oped in Florida. Some sands belonging to this formation have already 
been mentioned in connection with the sections of other formations. 
In the descriptions of sections made by Vaughan 1 in the vicinity of 
Tallahassee, the red sands are thought to represent the Lafayette for¬ 
mation, though there is a probability that they are in part weathered 
portions of Oligocene beds. 
Section on the St. Augustine road from Hancock's place to the 
Seaboard Air Line Railway, south side of railway. 
Red sandy clay (from plateau summit). 55 feet. 
Interlaminated gray clays and sands and gray clays (level of railroad) 16 feet. 
Contact of sands and clays shelves downward toward north, descending 
through 16 feet. The contact of sands and clays dips at a less angle 
than the clay for a stretch of 20 feet. 
In ravines, southern edge of Tallahassee, north of Seaboard Air Line 
Railway. 
Red sands to the top of the head of the gulch. 
Clay ... 35 feet. 
Gray grit, at..... 10 feet. 
Gray clay (apparently very siliceous), at.. 5 feet. 
Blanket of gritty sand. Base of bluff. 0-5 feet. 
The base of this section is probably 20 feet above the clay in the 
previous section. 
Section on Bellair Road, south from Tallahassee, south side Sea¬ 
board Air Line Railway. 
Soil, sand, etc.• • ..• •. 1 foot. 
Massive, plastic gray blue clay, cuboidal fracture. 10 feet. 
Sands and siliceous clay (of the appearance of the Alum Bluff). 3+feet. 
By aneroid, the base of this section is sixty feet below the capital 
terrace and thirty feet above the railroad crossing. 
Vaughan’s comment is that “the clays at this locality are lower 
than in Tallahassee and higher than on the St. Augustine road, i. e., 
the contact between the red sands and the underlying clays is an 
uneven surface.” The actual relations between the sands and clays 
were difficult to observe, but the indications from aneroid observations 
are that the sand rests on an uneven, probably eroded surface 
Section at McCullough’s Bridge, ten and a half miles northwest 
of De Funiak Springs, 2 just below mill pond. 
1 Vaughan, T. Wayland. Unpublished notes. 
2 Vaughan. T. Wayland. Unpublished notes. 
