CAHABA COAL FIELD: GENERAL DESCRIPTION. 15 
panying map; the different groups are also shown in their 
respective colors or tints in the vertical and the horizontal 
sections on said map. The rocks of tke ‘Millstone Grit 
Group” are colored the darkest tint; the rocks of the “Mi- 
caceous Group” are colored a shade lighter than the lowest 
group; the rocks of the “Productiva Group” are colored a 
shade lighter than the Micaceous Group, and’ the “Con- 
glomerate Group” is colored the lightest of all. This 
arrangement, I hope, will enable any one to see at a glance, 
the class of measures that come to the surface in different 
parts of the field. 
The Cahaba Coal Field, like the Warrior and Coosa 
Fields, has a great “fault” along its south and southeast. 
boundaries ; this is what miners term an “upthrow” fault. 
For convenience we have named this the “great boundary 
fault.” Unlike the Warrior Field, this has also a similar 
fault extending down the middle of the field in its southern 
half; this we have named the “interior fault.” At the 
southern boundary of the field, west of Montevallo, the 
measures show two faults, the one corresponding to the 
boundary fault above mentioned, the other, a mile to a mile 
and a half north of it, following near the old Coffee and 
Freeman line, for some eight or nine miles. Between these 
two faults the Coal Measures, including six workable seams 
of coal, have been completely overturned, and left dipping at an 
angle of sixty degrees towards the southeast. In addition to 
these, there is a fault separating the Lolley from the Dry 
Creek Basin, which I have termed the Piney Woods fault, 
from its position along a creek of that name; and further 
north, the Beaver Dam fault, between the Dry Creek Basin 
and the Eureka Basin, named from Beaver Dam Creek 
which flows nearly along the line of the fault. Besides 
these faults there are undulations or waves in the measures 
producing the shallow synclinals with the almost level 
measures of the Montevallo, the Lolley, the Dry Creek, 
Dailey Creek, and Blocton Basins with their separating anti- 
clinals. 
Outside the flat and undulating measures just mentioned, 
and the vertical measures near the faults, the strata of the 
Cahaba Field show an almost uniform southeast dip. 
