24 FLORIDA GEOLOGICAL SURVEY TENTH ANNUAL REPORT. 
Silica (Si 0 2 ) 34.03 
Calcium oxide (CaO) 19.80 
Magnesium oxide (MgO) + 12.39 
Iron and Alumina (Fe 2 03 and A 1 2 0 3 ) 3.20 
Phosphoric acid (P 2 0 5 ) Trace 
Sulphate (SO*) Trace 
Moisture (H 2 0 ) ‘ 1.32 
Samples of rock sent in to the State. Chemist’s office for analysis 
and reported to come from this formation in Liberty county, were 
found to contain from 32.66 per cent to 69.25 per cent of bone 
phosphate of lime. These analyses are. recorded as numbers M438. 
M442 and M985 in the reports of the Florida State Chemist. They 
probably represent localized enrichment in rock that, as a rule, is 
of low grade. 
ROAD MATERIALS. 
The principal road building materials of this area are sandy 
clays, limestones and recent oyster shells. The clays are very gen- 
erally distributed over the northern part of Gadsden county and 
the west central portion of Liberty county. The limestones are 
found chiefly in the western part of Gadsden county, but have not 
up to the present been used for road surfacing. Recent oyster 
shells are extensively used as road material in the southern part 
of the area in Franklin county. 
WATER SUPPLY. 
The water supply in this area is obtained principally from deep 
and shallow wells and springs. The well from which the city wa- 
ter supply at Quincy is taken has a depth of 766 feet. Other ar- 
tesian wells in this vicinity range in depth from 602 to 940 feet. 
Shallow wells range in depth from 50 to 90 or more feet and give 
a good supply of soft water. The city well at Apalachicola has a 
depth of 363 feet and the water rises in the casing to within about 
6 feet of the surface. Flowing artesian wells are obtained along 
the bay shore at depths of from 325 to 620 feet. The water from 
the deeper wells contain more or less salt. At Carrabelle the Car- 
rabelle Ice Company own a well reported 1,018 feet deep. This 
