Trans. N. Y. Ac. Sci. 



16 



Oct. 31 



bed known is one about three feet thick, yielding a fair quahty of bitum 

 inous coal, which crops out and has been traced for several miles near 

 the Clear Fork of the Brazos river in Young County. This supposed 

 coal region has a general N. E. and S. W. direction. 



Approaching Graham the prairies begin to resemble the plains ; and 

 the ridges, capped with sandstone, show bases of mottled reddish-colored 

 shales, or clay; salt springs and salt streams are found, indicating the 

 border of the great alkaline region. From Graham to Fort Griffin in 

 Shackleford County, thence north in Throckmorton County, the country 

 rises. Every few miles a steppe is mounted, the face of the escarp- 

 ments showing horizontal thin limestone strata. The same features 

 continue, and then the country slopes towards the Brazos river. 





Scale — 52 Miles to i Inch. 



A. 



B. 



C. 



HI. 



Hn. 



Archer County. 

 Baylor County. 

 Clay County. 

 Haskell County. 

 Hardeman County. 



Wa. Wichita County. 



Wr. Wilbarger County. 

 c. c. c. 'Copper Bed. 

 .?■ ff- S- Gravel Drift. 

 n. Narrows. 



Turning westward through Haskell County, the surface lowers again 

 towards the Brazos, the river coursing south to north, and a plain is 

 crossed, the ground differing from any observed. The soil is mixed and 

 covered with gravel, in many places several feet deep. The pebbles 



