254 GEOLOGICAL SUEVEY OF THE TERRITOEIES. 



The beds are very irregular in structure, and also in color. The same bed 

 may be conglomeritic at one place, and then gradually become fine, while 

 the color will shade from a deep red into white or gray. Not only are 

 , the beds crushed together, but they are also broken, as seen in the illus- 

 tration. The line F G represents the fracture. As we go up TeocalU 

 Creek the beds on the west side dip at first at a very small angle, not 

 more than 5^, to the south or southwest. Farther up it is 45°, and this 

 soon increases to 80°. As we go west, along the ridge, we find that the 

 beds are completely turned over past the vertical. Mr. Taggart was oh 

 the ridge, and found Carboniferous fossils in beds that were inverted. 

 On the east side of the creek is a high pyramidal mountain, (Teocalli,) 

 which I ascended. Its height is 13,098 feet, and it rises over 3,000 feet 

 above the bed of the creek. The stratification of the rocks composing it 

 is almost horizontal, and they have weathered into curious forms. On 

 the east and south is a series of enormous steps, while the north face 

 presents castellated forms. The rocks are all very much metamorphosed, 

 and are of a dark maroon-red color. At the base on the southern side 

 Mr. Taggart found the following beds from below upward : 



1. Yellow conglomerate. 



2. Purplish limestone. 



3. Yellow limestone and purple shales. 



4. Purple shaly limestone. 



5. Compact brownish-red sandstone. 



6. Green cherty limestone. 



7. Purple sandstone. 



8. Sandstones. 



These beds all dip about north 45'^ east, at an angle of about 55^. He 

 was unable to carry the section any higher, as the slopes were grassed 

 over. The mountain stands on the southern edge of the eruptive island 

 of which Italian Mountain is the most eastern high point. Here it is 

 rather narrow ; but to the east, south of Castle Peak, it widens, as it also 

 does around White Eock Mountain, to the northwest of which it again 

 narrows and ends, the sedimentary beds not having been broken 

 through. 



The following section was made from the summit of Teocalli Mountain 

 in descending order : 



Section No. 26. 



1. Very fine textured laminated sandstone, generally of a maroon color, 



although grayish in some places. They have been very much 

 changed. Thickness about 350 feet. 



2. Yellowish metamorphosed sandstone, 50 feet. 



3. Metamorphosed conglomerate gray matrix, with large purplish peb- 



bles, 50 feet. 



4. Fine-grained sandstone streaked with lines and spots; general color 



reddish maroon ; about 50 feet. 



5. Gray conglomerate, with interstratifled purplish and grav sandstones, 



200 feet. 



6. Gray sandstone and conglomerate, 150 feet. 



7. Coarse-grained light gray sandstone, greenish in places, 6 to 8 feet. 



8. Sandstone conglomerate, 5 feet. 



9. . Light-grayish brown sandstone, 50 feet. 



10. Coarse greenish variegated sandstone, 20 feet. 



11. Space probably filled with sandstones that are yellow, judging from 



the debris ; 55 feet. 



