SECOND ANNUAL REPORT—STRATIGRAPHIC GEOLOGY. 73 
At White Springs on the Suwanee, the following section was obtained: 
I. Gray soil, sand, and humus...... 2 ft. 
II. White sand ..... 4 ft. 
III. Clay with silicified corals and oyster (Hawthorne beds). 6-8 ft. 
IV. Indurated clayey rock (Hawthorne beds?). 2 ft. 
V. Clayey sand-rock, rather fine grained and soft. 4 ft. 
VI. The same, somewhat coarser and harder. 8-10 ft. 
VII. Sand rock of coarser sharp grains, coated and cemented to¬ 
gether with white limy matter. 4-6 ft. 
VIII. Foraminiferal Eocene top-rock (Vicksburg) indefinitely below. 
The silicified corals of bed III are sometimes 20-60 pounds in weight and 
along the river when dislodged from the clay often wear immense pot holes in 
the softer lime rocks. Miocene sharks’ teeth and fragments of bone also occur 
in the clay. Under bed VIII, when it is tilted up, as occurs in various places 
along the river, is found the older Orbitoides limestone of the Vicksburg group. 
In a sink 4 miles north of Lake City, the following section was observed: 
I, II. Sand and sandy soil . 5 ft. 
IV. Indurated clayey rock . 2 ft. 
VII. Lime cemented sand-rock . 8 ft. 
VIII. Foraminiferal Eocene (indefinitely down). 
At White Springs numerous specimens of Cassidulus were obtained 
from a cherty rock which has been used in constructing a foundation 
for the spring house. According to reports, which were obtained from 
well-informed residents of the town, this rock was quarried from the 
river channel. At the time of the field investigations for this report 
the river was too high to permit an examination of the outcrop in the 
river channel; but a subsequent examination by Mr. Stephenson 1 re¬ 
sulted in finding the cherty beds of the Hawthorne formation in close 
proximity to exposures of the Alum Blufif formation. This strengthens 
the conclusion that was formed at the time of the earlier field work, 
that the Cassidulus-bea .ring zone lies near the top of the Hawthorne 
formation. 
Two miles south of Lake City: 
I. Sandy soil .. 2 ft. 
III. Clay, with corals and oysters .. 20 ft. 
VII. Lime cemented sand-rock . 3 ft. 
VIII. Foraminiferal Eocene (indefinitely below). 
Near the southern boundary of Columbia County, at Fort White, the rocks 
are gently folded and the surface has been more or less worn into basins con¬ 
taining phosphatic breccia of the older lime rocks, which are themselves under 
these basins of phosphate slightly phosphatized in their upper portions. Here, 
owing to the fact that the Miocene and Foraminiferal Eocene (Miliolite) beds 
have been more or less broken up by the action of water dissolving or wearing 
away the softer parts, the Orbitoides limestone sometimes immediately under¬ 
lies the breccia in the basins and in other places the basins are composed of the 
Miliolite limestone. Beds VI, VII and VIII, of the above series are more or 
1 Stephenson, L. W., Unpublished notes. 
