TRIASSIC. 427 



No. 8 of the above section is the top of the Triassic, while that of Nos. 9, 

 1 0, and 1 1 belong to the Blanco Canyon Beds. 



In No. 6 I found a number of unios that appear to be of the same species 

 as the TJnio dockumensis, yet these are in a higher stratum than where I ob- 

 tained the other specimens. The shells are covered with calcareous matter, 

 and it was difficult to see the markings on the outside of them. 



The following section at the head of Hades Creek, a prong of North Cro- 

 ton Creek, and about thiee miles east of the above section. This section will 

 show the connection between the underlying Permian beds and the Triassic: 



1 . Gypsum, with small round crystals, " plum pudding " 3 feet. 



2. Red clay 10 feet. 



3. Massive white gypsum , 2 feet. 



4. Red clay, with seams of fibrous gypsum traversing it in every direction 55 feet. 



5. Red sandstone 2 feet. 



6. Red clay 60 feet. 



7. Sandstone and conglomerate, with fossil wood 20 feet. 



Total 152 feet. 



The fossil wood in No. 7 of the above section is very abundant and some 

 of the pieces very large. One tree at this place is about two feet in diame- 

 ter and sixty feet long. 



Pure fresh water is found everywhere in the sandstone and conglomerate, 

 but as soon as the strata below are reached the water is highly impregnated 

 with gypsum. The erosion of the red clay has been very great, both of the 

 Permian and Triassic, before the deposition of the conglomerate of the last 

 section. The red clay that is found elsewhere below the conglomerate has 

 been entirely carried away. 



The following section made near the Headquarter Ranch of the Espuela 

 Cattle Company will show this bed of Triassic clay and its relation to the 

 conglomerate. Beginning at the bottom: 



1. Red clay, with thin white seams 6 feet. 



2. Blue clay, with seam of white sandstone in the middle two inches thick 1 foot. 



3. Red clay, with seams of blue clay one-half inch thick 2 feet. 



4. Blue clay, with seams of white sandstone 1 foot. 



5. Red clay, with thin seams of red sandstone 8 feet. 



6. Blue clay, with thin seams of sandstone . 1 foot. 



7. Red clay, with seams of sandstone 6 feet. 



8. Bluish clay, with seams of sandstone 2 feet. 



9. Conglomerate, with petrified wood , 



Total 27 feet. 



In No. 1 of the above section the seams of white are sometimes not more 

 than one-half of an inch thick, yet they show along the whole length of the 

 face of the exposure, a distance of at least two hundred feet. The dip of the 



