OCKLOCKNEE AND AUCILLA RIVERS. II 3 
are from 400 to 717 feet deep and terminate in the Eocene lime¬ 
stones. The wells at Monticello are reported to be from 400 to 800 
feet deep. Wells supplying water to private estates in Leon and 
Jefferson counties are for the most part from 200 to 350 feet deep. 
Shallow dug or driven wells are. used in many localities and obtain 
water either from the sands or clays or from the limestones. 
SPRINGS. 
The principal springs of this area are the large limestone springs 
of the belt bordering the coast. The area farther north receives 
the heavy rainfall which largely disappears into the overlying for¬ 
mations and reappears through the large springs near sea level. 
Aside from the limestone springs of the coastal belt there are 
numerous soft water springs in the upland section. These smaller 
springs receive, their supply of water from the sands and clays lying 
above the limestones. 
WAKULLA SPRING. 
Wakulla Spring is the largest of the springs of this area and is 
second in amount of flow only to Silver and Blue Springs in Marion 
County, while in the size of the basin and the depth of the water it 
probably exceeds all other springs of Florida. The spring is the 
immediate source of Wakulla River, which flows into the Gulf at 
St. Marks. In February and March, 1917, many of the large 
springs of the State were measured by the State Geological Survey 
in co-operation with the U. S. Geological Survey. The flow of 
Wakulla Spring at that time (Feb. 12), measured at the bridge 
three miles below the spring, was found to be 122,000 gallons per 
minute. The width of the basin of this spring is about 400 feet, 
while the depth of the water in the basin is probably about or some¬ 
what less than 80 feet. As with many of the limestone springs, the 
water is remarkably clear, and objects may be clearly seen at the 
bottom of the basin. 
WACISSA SPRINGS. 
Wacissa Springs in Jefferson County include a group of springs 
the combined flow of which make up the Wacissa River, which flows 
into the Aucilla River near the Gulf. These springs emerge near 
or somewhat above tide water level and are not well confined to a 
