CRETACEOUS FORMATION. 109 



feet in thickness, a sample from which has been tested 

 by Dr. Eies, No. 62 S. The country for several miles 

 in all directions about Rollins' is rough and hilly, the 

 tills capped with beds of pebbles and a ferruginous 

 sandstone crust, but the beds of clay, interstratified 

 wit'h sands, seem to make up a very considerable pro- 

 portion of their bulk. 



COLBERT COUNTY. 



In the northern andl eastern parts of this county 

 the strata of the Subcarboniferous formation make 

 the surface, but in the southern and western parts 

 these older formations are covered by the mantle of 

 sands, pebbles and clays of Tuscaloosa and Lafayette 

 formations, the former of which carries the impor- 

 tant clay deposits here as elsewhere. The best of 

 these clays occur near the westtern border of the 

 county, as well as in the adjacent parts of Missis- 

 sippi. 



The station Pegram, on the Memphis and Charles- 

 ton Railroad, seems to be about the central point in 

 ithis clay region. Some extensive works for the man- 

 ufacture of fire brick and other kinds of brick have 

 been established here under the name of the "Ala- 

 bama Fire Brick Works." The clay is obtained from 

 the southwest part of S. 27, the northeastern part of 

 S. 3, and the northwestern part of S. 34, in T. 3, E. 15 

 W. The clay appears in several beds, as shown by 

 the section below, which is taken from the notes of 

 Dr. Little. 



Section near Pegram, Colbert Co. 



Pebbles of large size with sands 30 feet 



White clay, one-eighth of a mile from mill 3 feet 



Small gravel \ .' 1 foot 



White clay, sample No. 55, S 6 feet 



Sand with large gravel overlying 16 feet 



Yellow clay, sample No. 56, S 6 feet 



White clay 1 foot 



Purple and black clay, sample No. 57, S 10 feet 



Gray clay, sample No. 58 5 feet 



