PERMIAN. 409 



SECTION NO. 21. 



Made near the mouth of Dove Creek, three miles above Salt Flat. 



1 . Gypsum 10 feet. 



2. Red sandy clay 20 feet. 



3. Limestone , 1 foot. 



4. Red sandy clay 30 feet. 



5. G-ypsum 8 feet. 



6. Red and white spotted sandstone, water-bearing 20 feet. 



7. Gypsum 3 feet. 



Total 92 feet. 



The hills on the south side of Dove Creek are high and are composed of 

 red sandy clays that disintegrate very rapidly, so that it was impossible to 

 get a complete section. 



section no. 22. 



Made on South Croton Creek, five miles southwest of section No. 21. 



1. Red sandy clay with white spots 40 feet. 



2. Massive gypsum 3 feet. 



3. Red sandy clay 10 feet. 



4. Massive gypsum 4 feet. 



5. Red sandy clay 10 feet. 



Total 67 feet. 



SECTION NO. 23. 



Made on South Croton Creek, two miles southwest of the locality of Sec- 

 tion 22. 



1. Red clay 20 feet. 



2. Gypsum 1 foot. 



3. Red sandy clay. . . , 30 feet. 



4. Gypsum 3 feet. 



5. Red sandy clay 40 leet. 



6. Gypsum 4 feet. 



7. Red sandy clay 25 feet. 



Total ; 123 feet. 



The country from the top of this section slopes gradually to the west to 

 Duck Creek, and is covered with drift. From Duck Creek to the Salt Fork 

 of the Brazos is a high rolling prairie, with an occasional small ravine or 

 creek. The country is covered with drift sand and pebbles from the disin- 

 tegrated strata at the foot of the Staked Plains. 



