t)2 CEMENT MATERIALS AND INDUSTRY. [bull. 243. 
at only a few points by the railroads leading out from Huntsville and 
Florence, and no commercial use has as yet been made of the rock. 
In the narrow anticlinal valleys below enumerated erosion has in 
most cases sunk the floors of the valleys into Cambrian strata, and, as 
a consequence, the Chickamauga limestone occupies a narrow belt on 
each side, near the base of the Red Mountain ridges. But since a fault 
usually occurs on one side of these valleys, the tied Mountain ridges 
and the accompanying Chickamauga limestone are more full} 7 repre- 
sented on the unfaulted side, which is the eastern side in all except 
Murphrees Valley. While the Chickamauga forms practically a con- 
tinuous belt along the undisturbed side, extensive areas are sometimes 
found on the faulted side also. This is the case, for instance, at Vance, 
on the Alabama Great Southern Railroad, where the rock is quarried 
for flux for the furnace of the Central Iron Compan}^ at Tuscaloosa. 
Analysis 1 of the table on page 69 shows its composition here. Other 
series of analyses from lower ledges in the quarry show only 1.22 per 
cent of silica, but more magnesia. 
In cases where erosion has not gone so deep as to reach the Cam- 
brian the Chickamauga may be found extending entirely across the 
valleys. This is the case in the lower part of Browns Valley from 
Brooksville to beyond Guntersville. Above Guntersville the Chicka- 
mauga is seen mainly on the eastern side of the valley. The river 
touches these outcrops at many points, and at Guntersville the rail- 
road connecting that city with Attalla woidd afford an additional 
means of transportation. No developments have yet been made in 
this area. 
The valley separating the Warrior from the Cahaba coal field is 
known as Roups Valley in the southern and as Jones Valley in the 
northern part. In these the Chickamauga limestone occupies a nar- 
row, continuous belt, usually near the base of the eastern Red Moun- 
tain ridge, though in places it is high up on the ridge and even at its 
summit, as at Gate City, where the quarries of the Sloss Iron Com- 
pany are located. Man^ analyses of the rock from this quarry have 
been made, and several are given in the table on page 69 (Nos. 2, 3, 4, 
5, 6). 
In Murphrees Valley the continuous belt of Chickamauga lime- 
stone, as above explained, is on the western side, while the faulted 
remnants are on the eastern side. No quarries have been opened in 
the Chickamauga limestone here, but the Louisville and Nashville 
Railroad goes up the valley as far as Oneonta and would afford means 
of transportation. 
In Cahaba Valley, which separates the Cahaba coal field from the 
Coosa coal field, the Chickamauga is well exposed on the eastern side 
for the entire length of the valley from Gadsden down. It expands 
into wide areas near the southern end, where it has been quarried for 
