PEALE. I 



GEOLOGY — SECTION NO. 25. 253 



becomes more and more toward tlie south, and we pass over red sand- 

 stones and conglomerates. The matrix of these conglomerates is a 

 coarse red sand, in which are large pebbles of limestone. The angle of 

 the dip to the southwest is 25°. This is at a point about a mile' below 

 the forks. A number of beautiful falls and cascades diversify the 

 course of the stream. Below these the dip changes, and it is toward 

 the north and northeast. This corresponds exactly with what we saw 

 on Cement Creek. Below, in all probability the Silurian layers may 

 be discovered, although I did not have time enough here to identify 

 them. 



About two miles below the forks a large creek comes in from the 

 northwest. It rises under Castle Peak, and I will have occasion to refer 

 to it again when I speak of the peak. From its mouth a broad open 

 valley reaches almost, without interrnptiou, to East Eiver. Just above 

 the mouth, on the east side, in the bed of the creek, there is an outcrop 

 of quartzite, below which are shales. On the west side, reaching up 

 for 400 or 500 feet, are limestones, above which we find the red-beds. I 

 cannot say with certainty of what age these beds are, but they are 

 probably Carboniferous. A little less than a mile farther down the 

 stream we find, on the west side, outcrops of Cretaceous rocks, consist- 

 ing mainly of calcareous clay shales, with interlaminated limestones. 

 In one of the upper layers I discovered fossils agreeing with those I 

 found east of the mountains in bed l^o. 2 of section No. 1. The bed has 

 the same characteristics, including even the bituminous odor on fracture. 



Above we find from 25 to 30 feet of rough conglomeritic sandstone of 

 a rusty yellow color ; next are thick beds of laminated limestone. All 

 these beds dip toward the northeast. Crowning the hill are red-beds. 

 There is, 1 think, a fault running through here. Its direction is proba- 

 bly northwest and southeast. It extends across Teoca,lli Creek also. 

 Here, however, the beds are very much confused, seeming to have been 

 crushed together. Mr. Holmes has made a very excellent drawing of 

 the appearance of the beds on the west side of Teocalli Creek in 

 Plate XVI. The following section was made here, the letters being the 

 same as those in the illustration : 



Section No. 25. 



^ 1. Conglomerate of large limestone pebbles in a red") Thickness not 

 . j siliceous matrix. ' ! accurately 



" ] 2. Fine red sandstoDe shales, with bands containing [taken; about 



[ nodules. 3 10 to 15 feet, 



p ) 3. Very hard, compact, dark and blue, almost black, limestone ; 8 

 ' ( inches to 1 foot. 



\ -1. Purplish blue limestone; weathering, reddish on surfaces; 1 to 2 



I feet. 



C { 5. Steel-gray quartzitic sandstone, 1 foot. 



I 0. Soft light-gray calcareous sandstone, shaly below, 10 feet. 



[7. Eed sandstone, fine grained, and somewhat soft, 2 feet. 

 j-j ( S. Gray sandstone, 3 feet. 



\ 0. Soft gray sandstone shale, 2 feet. 

 E 10. Conglomerate, G feet. 



Below the beds given in this section we have as follows : 



lied sandstones, 10 feet. 



White sandstones, 15 feet. 



Eed sandstone, 8 feet. 



Mottled sandstone shales, 10 feet. 



