FLORIDA state; geological survey. 
204 
abundant especially toward the base. The sand also is coarser near 
the base. A stratum of iron concretions occurs 13 feet from the base. 
This formation here rests upon pinkish sandy clay. Along the river 
road south from River Junction frequent exposures of this formation 
occur. In one of these exposures about three and one-half miles south 
of River Junction as much as 22 feet of the coarse sand pebble con¬ 
glomerate is seen, while iron concretions remain in profusion, the re¬ 
siduum of that part of the formation which has been removed by 
erosion. In these exposures the formation upon decay becomes mot¬ 
tled and blotched to a depth of one to five feet, attended often with 
the formation of indurated crusts. 
About two miles northeast of Aspalaga Bluff (Sec. 29, T. 3 N., 
R. 6 W.) an exposure occurs showing 20 feet of this formation. At 
the top, this section is discolored and blotched by decay and is over¬ 
laid by about 3 feet of ochre yellow sand with iron concretions which 
has resulted apparently from the decay of this stratum. The forma¬ 
tion here rests unconformably upon yellow-red sandy clays with white 
partings. Eight feet of this latter formation are exposed. 
In the section in Liberty County about one mile east of Rock Bluff 
Landing as much as 36 feet of this material is seen in place. Exposures 
are also seen at the heads of streams one to one-half miles south of 
Bristol. Along the Chipola River, at Darling’s slide, 14 feet of similar 
material is seen lying beneath 11 feet of pale yellow sand, and above 
the sandy micaceous clay and fossiliferous Miocene marls. The matrix 
holding the plastic kaolin or ball clay ui the. peninsular section of the 
State is as previously stated (p. 242) of similar material and apparent¬ 
ly represents an eastward and southward extent of this formation in 
a slightly modified form, being here locally free from iron staining. 
Passing to the east in Gadsden County from the Apalachicola River 
one scarcely finds materials of this formation so coarse in texture as 
that seen along the river. White water worn pebbles, however, are 
present and coarse lenses occur occasionally. The Seaboard Air Line 
railroad in passing on to the plateau at the head of Mosquito Creek 
cuts through reddish sands near the top of the section, which from 
their position are probably the eastward extent of the same formation. 
In this exposure, however, and usually throughout central and eastern 
Gadsden County, as well as in Leon County the sands of this forma¬ 
tion are less coarse in texture than near the river. In the section at 
Nicholson (p. 284) this formation is represented by 10 to 12 feet 
of non-stratified faintly cross bedded medium coarse sands which 
lie unconformably upon finely laminated sandy clays. Although usually 
a sand varying in texture from medium coarse to very coarse, this 
formation contains also clay lenses of limited extent. 
