SECOND ANNUAL REPORT—STRATIGRAPHIC GEOLOGY. 
97 
with the Chattahoochee limestone is distinct and without apparent unconformity 
or transition beds of any kind. 
This section was measured on the highest part of the bluff, which is the 
first approached as the turn of the river is made in descending: 
Section of Rock Bluff, Apalachicola River, Florida , 
1. Superficial sands, thin and variable, say.. 3 feet. 
2. Reddish clayey sand and gravel, about........ 15 feet. 
3. Greenish-white compact marl, with fossils. . 67 feet. 
4 Chattahoochee limestone, to water.......... 12 feet. 
Total thickness above water ... 97 feet. 
The list of fossils given under the head of paleontologic characters 
indicates the correctness of the conclusions reached on the basis of 
purely stratigraphic work, for they show that the fullers earth beds 
are to be correlated with the Alum Bluff formation. 1 
About 1900 the fullers earth deposits of northern Florida were in¬ 
vestigated by Vaughan, 2 and the results of his studies were published 
in the volume on Mineral Resources of the United States for 1901. 
The sections given below are taken from this report : 3 
Mosquito Creek. —There is an exposure of fuller’s earth on the south bank 
of Mosquito Creek, near the foot of a bluff, on land belonging to Mr. John D. 
McPhaul. The overburden is here too great for working. The deposit is along 
a small stream running north into Mosquito Creek in the NW. of Sec. 16, 
T. 3 N., R. 4 W. A sample was taken at this locality where a pit had been sunk. 
A section in the pit shows overburden (sand), 4 feet; fuller’s earth, 6 feet. 
The bed was not completely penetrated. 
The material was also exposed in the bed of a creek nearby. The slope 
down to the creek valley is gradual. A strip several hundred yards wide and 
probably half a mile long could be worked. Fullers earth occurs also on the land 
of Mr. A. J. Key, in Sec. 15, T. 3 N., R. 4 W.; and on the land of Mr. Elias 
Howell, in Sec. 10, T. 3 N., R. 4 W., and extends also along the creek about 
one-half mile below Mr. McPhaul’s. 
Near Quincy. —The following is a section through the fullers earth at the 
Chesebrough Manufacturing Company’s mine, 1 mile south of Quincy. The sec¬ 
tion was given by T. L. Ward. 
Section of Chesebrough Manufacturing Company’s Mine. 
5. Overburden of clay and sands. 7 feet. 
4. Fullers earth (average).,.. 4 feet. 
1 A section made since the above was written by E. H. Sellards and 
Herman Gunter, published in the following paper on fullers earth deposits, shows 
that the fullers earth stratum at Rock Bluff lies immediately above the gray sand 
or marl of the above section and at a level approximately 100 feet above the river. 
2 Vaughan, T. Wayland. Fuller’s earth, Mineral Resources of the United 
States, U. S. Geol. Survey, 1901, pp. 926-932. 
3 Vaughan T. Wayland. Mineral Resources of ■ the United States, U. S. Geol. 
Survey* 1901, pp. 928-929. 
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