PERMIAN. 405 



SECTION NO. 12. 



Made west of California Creek, near our line. 



1. Blue clay 2 feet. 



2. Argillaceous limestone 2 feet. 



3. Blue clay 6 feet. 



4. Red clay 8 feet. 



5. Limestone .... 1 foot. 



6. Thin bedded limestone, Pleurophorus . 3 feet. 



7. Limestone 1 foot 6 inches. 



8. Rotten limestone 2 feet. 



Total : . 25 feet 6 inches. 



Above the last section and to the west of it there is a broad, level plateau 

 extending three miles to the breaks on Paint Creek. On this plateau the 

 prairie dogs have brought up from their holes clay of a deep red color, and 

 as soon as the bluffs on Paint Creek are reached it is seen that there is a com- 

 plete change in the character of the strata. East of California Creek the 

 rocks were all limestones and the clays were all blue. On the west side of 

 the creek the rocks are all sandstones and the clays deep red. 



The sandstones are thin-bedded and many of them cross-bedded, and 

 the bedding dips at various angles and in different directions. In this thin- 

 bedded sandstone are a great many tracks of insects. 



At this locality are two beds of the conglomerate that is peculiar to the 

 Permian, which is found at different localities and positions in the strata. 



In the conglomerate and red clays of this place a number of vertebrate fos- 

 sils were found, and it is in this section that the second bed of copper clay 

 occurs. The following section was made at this place: 



section no. 13. 



1. Dark red clay, with vertebrates, bottom not seen 10 feet. 



2. Conglomerate 6 inches. 



3. Red clay 4 feet. 



4. Thin bedded sandstone, with insect tracks 10 inches. 



5. Red clay 4 feet. 



6. Blue clay, with copper concretions 4 feet. 



7. Sandstone, concretionary 10 inches. 



8. Red clay, with clay concretions 8 feet. 



9. Thin-bedded sandstone , 8 inches. 



10. Cross-bedded sandstone 10 inches. 



11. Conglomerate, with remains of vertebrates 6 inches. 



Total 34 feet 2 inches. 



The country from this point in a northwestern direction has a gradual rise 



until the breaks of the Double Mountain Fork of the Brazos is reached. Just 

 34— geol. 



