GEOLOGY CHOCTAWHATCHEE AND APALACHICOLA RIVERS. 85 
near Cottonclale south to the Gulf near Panama City. About four 
miles south of Cottondale near Steele City the gravel is being quar- 
ried for road purposes. The material varies in size from small pea- 
like grains to rounded elongated pebbles five to six or more inches 
in length. Large deposits of gravel are known to occur in the vicin- 
ity of Round lake, although the only deposits quarried at the. present 
are those near Steele City. 
Farther south the gravel becomes smaller until near Panama City 
on the Gulf Coast it grades into an excellent grade of coarse building 
sand. 
WATER SUPPLY. 
The water supply in this area is obtained from wells and springs. 
The well from which the city water supply at Marianna is taken is 
386 feet in depth. The city well at Panama City is 630 feet deep. 
The public water supply at Vernon is obtained from a well 190 feet 
in depth. The well for public water supply at Bonifay is 518 feet 
deep. At Blountstown a flowing artesian well was obtained at a 
depth of 234 feet. From records published in the Fourth Annual 
Report of this Survey it is seen that artesian wells have been ob- 
tained throughout this area at depths varying from 115 to 630 feet. 
Shallow dug or driven wells are used in many localities and obtain 
water from the sands or clays or from the limestones. On the Gulf 
coast and for some distance inland on the streams flowing artesian 
wells are obtained at a moderate depth. 
SPRINGS. 
The principal springs are the large limestone springs in the 
northern part of the area. The largest and best known of these is 
Blue spring about six miles northeast of Marianna. This spring 
is the source of Blue Springs creek which flows into* the Chipola 
river. Morrison and Ponce de Leon springs in Holmes county 
are limestone springs which flow into Sandy creek, a tributary of 
the Choctawhatchee river. Aside from the limestone springs which 
are numerous there are many soft water springs in the clayey up- 
land section. These smaller springs receive their supply of water 
from the sands and clays lying above the limestones. 
