W. B. Emery — Ljneous Geology of Carrizo Mountain. 353 



"It does not appear to me that the beds of sandstone that 

 occur between the inner mass and the flexed sheets are of uniform 

 thickness. Between the capping of the North Mesa and the 

 inner mass the sandstones are nearly pinched out. They are so 

 obscured by debris that I could not determine their exact rela- 

 tion."* 



Dikes. — The few dikes seen in the Carrizo area, with the 

 exception of that forming Zilbetod peak, are arranged about 



Fig. 4. 



Fig. 4. Walker Peak, a volcanic Deck. 



the periphery of the intrusions. Of these, Holmes dike, near 

 the mouth of Tisnasbas Canyon, is among the most prominent. 

 It rises about 200 feet above the creek bed and when seen end 

 on, as in fig. 3, where its continuation northward is not evi- 

 dent, has the appearance of a volcanic plug. Another large 

 dike trends outward from the mountain in the direction of 

 Biltabito store. Other smaller dikes are present botli east and 

 west of the mountain and each volcanic plug has an encircling 

 * Holmes, W. H., op. cit. , p. 275. 



