65 



In Murphrees Valley the continuous belt of the Trenton, as 

 above explained, is on the western side, while the faulted rem- 

 nants are on the eastern side. No quarries have been opened 

 .in the Trenton limestone here, but the Louisville and Nashville 

 Railroad goes u'p the valley as far as Oneonta and would afford 

 means of transportation. 



In the Cahaba Valley, which separates the Cahaba coal field 

 from the Coosa coal field, the Trenton 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 lime burning, at Pelham, Siluria, Long- 

 view, Calera, and other places on the line of the Louisville and 

 Nashville road. Analyses 7, 8 and 9 of Table B, show the com- 

 position of the rock in this region. 



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 thte 

 flank of Colvin Mountain, supplies the rock for lime burning. 

 Anaylsis 10 shows the character of the rock at this point. 



At Pratts Ferry, on the Cahaba. River, a few miles above 

 Centreville, in Bibb County, the Trenton limestone makes high 

 bluffs along the river for several miles, and is in most conven- 

 ient 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 fine 

 quality and beautifully variegated. No analyses are avail- 

 able, but there is no doubt that much of the rock is sufficiently 

 low in magnesia to be fit for use in cement making. Cahaba 

 River and a short spur from the Mobile and Ohio Railroad 

 would afford transportation facilities for this deposit. 



In Big Wills Valley, which separates Sand and Lookout 

 mountains, the Trenton limestone occupies perhaps 25 square 

 miles, but it is crossed only by the railroad connecting Gadsden 

 with Guntersvlile. No anaylses are available. 



In the great Coosa Valley region the Trenton outcrops are 

 found mostly on the western border near the base of Lookout 

 Mountain, as in Broomtown Valley, and in other valleys ex- 

 tending south toward Gadsden. While these belts have been 

 utilized in the past for the old Gaylesville, Cornwall, and Round 



