SECOND ANNUAL REPORT—PULLERS EARTH. 
273 
Silica (Si0 2 ) .. 63.32 
Calcium oxide (CaO) 1.47, CaC0 3 (calculated) 2.63 
Magnesium oxide (MgO) 5.20, MgCO s (calculated) .................... 10.90 
Iron and alumina (A1 2 0 3 ), Fe 2 0 3 .. .. 11.64 
Phosphoric acid .. None 
Sulphate (S0 4 ) ...................................................... Trace 
Moisture (100 degrees F.) ... 6.22 
The upper part of the bluff in the line of sectioning at Aspalaga 
amounting to about sixty feet was covered at the time the section was 
made. Professor G. D. Plarris who made a section of this bluff in 
1901 found limestone containing Pecten and Placuna in place at an 
elevation of 145 feet above the base of the bluff. According to Harris’ 
observation the lower one-half or more of this covered interval is oc¬ 
cupied by deposits with at least occasional limestones or marls. Near 
the top of the section one should expect to find the coarse red sand 
common to this region, and in fact an exposure of ten or twelve feet 
of this material occurs near the public road, possibly one-half mile 
from the face of the bluff. Two miles northeast of Aspalaga in Sec¬ 
tion 29, T. 3 N., R. 6 W., an exposure occurs showing at the top of the 
plateau twenty feet of coarse red sand resting unconformably on sandy 
reddish clays with white clay partings. 
Section at Rock Bluff. 
Rock Bluff lies five and one-half miles in a direct line south of 
southwest of Aspalaga Bluff, or twelve and one-half miles from the 
State line. It is the second point at which the river in Florida strikes 
the east border of the river valley. That part of Rock Bluff which 
faces the river lies near the southwest corner of Section 17, R. 7 west, 
T. 2 north. The basal part of the following section is made near the 
north end where the river channel first strikes the bluff. From this 
point the level was transferred north across a small stream to that part 
of the bluff which does not now directly face the river. 
Thickness 
Height above river 
of stratum. 
(stage of Mar. 5,1909 ). 
11. 
Covered in the line of the section to the 
top of the bluff from the river, about 
N mile ... 
100 
feet 
100 
to 
200 
feet. 
10. 
Fullers earth (exposed) .. 
3 
feet 
97 
to 
100 
feet- 
9. 
Ledge with shells .... 
1 
foot 
96 
to 
97 
feet. 
8. 
Gray sand ....... 
5 
feet 
91 
to 
96 
feet. 
7. 
Ledge with shells .... 
2 
feet 
89 
to 
91 
feet. 
6. 
Gray sand with lime inclusions.. 
5 
feet 
84 
to 
89 
feet. 
5. 
Covered ... 
2 
feet 
82 
to 
84 
feet. 
4. 
Light gray calcareous sand containing 
a trace of phosphate (by transfer¬ 
ring the level across a small branch 
to the north the section is continued) 
30 
feet 
52' 
to 
82 
feet. 
