426 GEOLOGY OF NORTHWESTERN TEXAS. 



1. Red Clay 4 feet. 



2. Sandstone and conglomerate, cross-bedded 20 feet. 



3. Yellowish sandstone 6 feet. 



Total 30 feet. 



White River pours over these beds at this place with a fall of twenty-two 

 feet in one hundred feet distance. The amount of water flowing over these falls 

 is about 13,000,000 gallons per day at time of low water. The top of the 

 plains at a distance of two miles to the westward is two hundred and sixty 

 feet above the bottom of the section at the falls. 



The following section was made six miles below the falls. Beginning at the 

 bottom: 



1. Red clay, with thin white seams 40 feet. 



2. Cross-bedded coarse micaceous sandstone, yellowish 20 feet. 



3. Iron ore conglomerate 1 foot. 



4. Soft, friable sandstone - 30 feet. 



5. Conglomerate ' 30 feet. 



Total 121 feet. 



The conglomerate of the above section is composed of water worn siliceous 

 pebbles, and disintegrates very rapidly, leaving large beds of gravel at the 

 base of the precipices. 



In the conglomerate are impressions of the limbs and trunks of trees, but 

 at only one place in this vicinity did I find the fossil wood preserved. 



The beds of sandstone and conglomerate dip to the southeast, at nearly the 

 same rate as the fall of the river below the falls. None of the sandstone or 

 conglomerate are found above the falls, and at the falls are the first siliceous 

 pebbles to be found in descending the canyon. Above the falls there is an 

 entirely different formation, which I have called the Blanco Canyon Beds, 

 and which are described in another part of this Report. The following sec- 

 tion, made about six miles northeast of Dockum, will show the relation of the 

 Dockum and Blanco Canyon Beds. Beginning at the bottom: 



1. Red and blue clay , 20 feet. 



2. Conglomerate 12 feet. 



3. Sandstone, cross-bedded 10 feet. 



4. Conglomerate 6 feet. 



5. Red clay 30 feet. 



6. Conglomerate, containing Unio dockumensis 1 foot. 



1. Sandstone 8 feet. 



8. Cross-bedded sandstone 30 feet. 



9. Reddish sandy clay 180 feet. 



10. Reddish clay 10 feet. 



11. Hardened clay, top of Staked Plains 10 feet. 



Total 31*7 feet. 



