bckel.] ALABAMA. 63 
lime burning at Pelham, Siluria, Longview, Calera, and other places 
on the line of the Louisville and Nashville road. Analyses 7, 8, and 
9 of the table on page 69 show the composition of the rock in this 
•egion. 
The Central of Georgia and the Southern railroads cross this belt 
about midway of its length at Leeds, in Jefferson County, and near its 
northern end it is crossed by the Louisville and Nashville Railroad, 
where a quarry at Rock Springs, on the flank of Colvin Mountain, 
supplies the rock for lime burning. Analysis 10 (p. 69) shows the 
character of the rock at this point. 
At Pratts Ferry, on Cahaba River, a few miles above Centerville, 
in Bibb County, the Chickamauga limestone makes high bluffs along 
the river for several miles, and is in most convenient position for easy 
quarrying. 
Marble works have in former days been established here and should 
be again put in operation, since the marble is of tine quality and beau- 
tifully variegated. No analyses arc available, but there is no doubt 
jhat much of the rock is sufficiently low in magnesia to be tit for use 
n cement making. Cahaba River and a short spur from the Mobile 
md Ohio Railroad would afford transportation facilities for this deposit. 
In Big Wills Valley, which separates Sand and Lookout mountains, 
he Chickamauga limestone occupies perhaps '25 square miles, but it is 
rossed only by the railroad connecting Gadsden with Guntersville. 
^o analyses are available. 
In the great Coosa Valley region the Chickamauga outcrops are 
;ound mostly' on the western border, near the base of Lookout Moun- 
ain, as in Broomtown Valley and in other valleys extending south 
oward Gadsden. While these belts have been utilized in the past for 
he old Gaylesville, Cornwall, and Round Mountain furnaces, and pos- 
ibly for some furnaces now in blast, no analyses are available. 
Similarly, farther south, along this western border of the Coosa 
falle} r , and running parallel with the Coosa coal held in Calhoun, St. 
Hair, and Shelby counties, there are numerous long, narrow outcrops 
f Chickamauga limestone. The Calcis quarry of the Tennessee Coal, 
ron and Railroad Company, on the Central of Georgia Railroad, near 
>territt, is upon one of these outcrops, and furnishes limestone with a 
ery low and uniform percentage of silica and magnesia. Analyses 1 1, 
2, 13, 14, 15, and 16 exhibit the quality of the rock as received at the 
Insley Steel Works, but care is taken at the quarry to select ledges 
dw in silica and magnesia, and the analyses therefore represent only 
he selected ledges and not the average run of the quarr}^ as a whole. 
Near Talladega Springs, Marble Valley, and Shelby are other occur- 
ences of the rock, and a quarry a few miles east of Shelby furnace 
[as for many years supplied that furnace with its flux. The quality 
f the material here is shown by analyses 17, 18, 19, and 20 (p. 69). 
