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AX AMERICAN GEOLOGICAL RAILWAY GUIDE. (ALA.) 



15. At Oxford, the railroad crosses through a gap of 2 b. Potsdam, and thence to Cross Plains 

 the mountains of 2 b. Potsdam are on the east side. Beyond Cross Plains, to the State line, these 

 mountains can be seen from the cars. E. A. S. 



16. The railroad is built on 3b. Quebec or Knox dolomite almost all the way from Montevallo to 

 the State line, crossing 3 c. Chazy and 4 a. Trenton near Calera and the Coosa coal field above 

 Calera E. A. S. 



17. Yong_esborough narrow gauge railroad, 2K miles to Chewackla Lime Company's kilns, 

 southeast. The limestone of this company's quarries is a highly crystalline dolomite. W. G. ^ 



18. The hills on the west of the railroad consist principally of limonite, and their detritus 

 constitutes the bright red banks of the cuts and fills for many miles. The Thomas ore bank is on 

 east side, close to the main track, nearly opposite the station house. The hills seen beyond tnese 

 belong to the Warrior coal field. W.y. 



19. In addition to the 4 a. Trenton, there are within the limits of the city of Chattanooga the 3 a. 

 Calcif erpus, 4 b. Cincinnati, 5 Clinton, 10 a. Black shale, and 14. Carboniferous formations. 



[J. SAFFORD. 



