CAHABA COAL FIELD : GENERAL DESCRIPTION. 13 
an average width of five and eight-tenth miles, and contains 
a surface area of three hundred and ninety-four and a half 
(3943) square miles. In my computation of the amount of 
good, workable coal in this coal field, I have included all 
workable seams of two feet and upwards in thickness, and 
have excluded all seams in the vertical Coal Measures of 
the boundary fault, and those of the interior fault, for they 
are not workable at present and probably never will be, in 
either fault. The extreme limit in depth of the lowest 
seams embraced in my computation, is 4,700 feet vertical. 
With the above named limitations, this coal field contains 
an aggregate of 3626 millions of tons of coal (tons of 2.000 
pounds), from which the loss or waste in mining will have 
to be deducted. For the amount of coal in each basin, see 
the chapters on each particular basin. 
There are eleven basins in this coal field, besides the 
“Overturned Measures” at the south end of the Field. 
The horizontal sections on the accompanying map illus- 
trate the structure of nearly all of these basins. At the 
north end of this Coal Field along the line shown on map 
from “A” to “B,” is the Adkins Horizontal Section, giving 
the structure of the north end of the basin and relative 
positions of seams. The Henryellen Horizontal Section gives 
the structure of the basin and relative positions of seams 
along the line from “C” to“ D.” The Deshazo Horizontal 
Section gives the structure of the basin and relative position 
of the seams along the line on the accompanying map from 
“BR” to “F.” Below this is the Acton Basin Horizontal Sec- 
tion along the line from “G” to “H,” with relative position 
of same. The Helena Horizontal Section along the line from 
“T” to “J,” gives the structure of the Cahaba Basin and 
the Helena Basin, with relative position of seams in same. 
The Dry Creek Horizontal Section along the line on ac- 
corapanying map from “K” to “L,” gives the structure of 
the Gould Basin, and the Dry Creek Basin, with relative 
position of seams in each one. 
The Blocton and Montevallo Horizontal Section, along the 
east and west line on accompanying map from “M” to 
“N,” gives the structure of the Blocton Basin; also that 
of the Dailey Creek Basin and that of the Montevallo Basin 
with the relative position of the seams in each basin. 
