180 GEOLOGICAL SURVEY OF ALABAMA. 
ruas a short distance up into the Coal Field and separates 
a small strip of synclinal structure from the main body of 
the Coal Field. This synclinal extends southwestward as 
far the limits of the map, with Sub-Carboniferous and Clin- 
ton rocks, the Coal Measures ending at about the latitude 
of Vance’s station. The Clinton strata of this synclinal are 
much broken up and appear to be pinched out in places. 
The red ore occurs in the vicinity of Vance’s, at one or two 
points southwest of the station, and in the railroad cut two 
miles west of the station. Further to the southwest than 
the points named, the Clinton is represented by sandstones 
and conglomerates alone, and the red ore seems to be 
wanting. 
The anticlinal fold above spoken of is faulted near its 
central line, and the rim of the Clinton rocks which would 
normally run along the western side of the anticlinal has 
been cut out by the fault with the exception of a small 
remnant seen in the railroad cut above mentioned. By the 
fault a strip of Knox Dolomite has cut out about half of the 
anticlinal as shown on the map. To the northeast of the 
railroad the anticlinal is occupied only by the Oxmoor 
Shales of the Sub-Carboniferous. In addition to the great 
fault above noticed there is a smaller one which shows in 
the railroad cut to the west of the trestle over the branch 
of Hurricane Creek. This structure will be more easily un- 
derstood from a study of the map than from the reading of 
a description. The superficial beds of the Tuscaloosa for- 
mation overlying all the older rocks makes it extremely 
difficult, and in some cases impossible, to determine with 
certainty the structure of the lower part of the valley south 
of Vance’s. 
