SUBCARBONIFEROUS FORMATIONS. 79 



with the clay is also of value in the manufacture of 

 stoneware. 



In the N. E. J of the S. E. J of S. 4, T. 5, R. 10 E. 

 are the Montague Clay Mines, worked by a tunnel on 

 the southeastern side of the ridge. The clay is about 

 thirty feet in thickness, some cf it having a brown cpl- 

 oraltion, due to organic matter. It is quite uniform 

 in composition for a distance for at least a mile in a 

 northeast and southwest direction, is quite free from 

 stains of iron but perhaps less plastic than the clay 

 from some of the Other localities near by. Most of 

 the clay here mined goes to Chattanooga for the man- 

 ufacture of fire brick. Two analyses of the clay 

 from these mines are given by Dr. Hies under the 

 numbers 116 and 117* and they are classed by him as 

 fire clays. 



Further southwest, along the ridge, we find other 

 occurrences of the clay as in the S. W. * of t'he N. W. J 

 of S. 12, T. 6, R. 9 E., where there is an old open- 

 ing on a clay bed, which shows some four feet of clay. 

 Still further south westward' in the N. W. J of the 

 S. E. -J of S. 15, T. 6. R. 9 E., there are numerous sur- 

 face diggings, and tunnels; in a clay bed thirty feet or 

 more in thickness. Some of the clay of this deposit 

 is of most beautiful quality, and especially well 

 suited to the manufacture of the finest stone ware. A 

 set of china ware, TOO pieces, made from this clay 

 took a premium at the New Orleans Cotton Exposi- 

 tion. 



In places the clay has streaks and stains, due to 

 iron, and in other places it has a dark gray color, due 

 to the presence of organic matter, which does not pre- 

 vent its burning to a white color. Much of /the clay 

 is adapted to the manufacture of fire brick as shown 

 by the analyses of a sample collected by Dr. Ries, 



