82 GEOLOGICAL SURVEY OF ALABAMA. 
Horizontal Scction from “K” to “LL,” on the accompanying 
map, will give the relative position of the seams in this 
basin ; the Dry Creek Horizontal Section showing the form 
or structure of the basin and its connection with the Sub- 
Carboniferous and the Interior fault vertical measures. 
The rate of dip of the measures of this basin varies 
mostly between fifteen and twenty-two degrees, and in 
some localities considerably more ; the dip is nearly every- 
where towards the southeast. There has been no mining 
hitherto in this basin as above stated, as it is only recently 
that railroads have begun to be constructed here. This, 
though, will soon be a thing of the past, for at present a 
great number of loud reports like the discharge of distant 
cannon can be heard daily and hourly made by the blasting 
operations going on in the construction of the Brierfield, 
Blocton and Birmingham Railroad through this basin. 
Notr.—I have the information from a source that appears to be 
trustworthy, that in S. 12, T. 20, R. 4 W, in Genery’s Gap, the Brock 
seam has been exposed in the railroad cut, and shows a thickness of 
four feet. E.A.S. 
