310 D. W. JOHNSON VOLCANIC KECICS OF MT. TAYLOR REGION 



.Structural Details 



We iiiaj' now consider ilie stnictural details of some of the ]\louut 

 Taylor buttes, after which it will be iu order to examine critically the 

 several theories which might be advanced in explanation of their origin. 

 Doubtless most of the bnttes have names by which they are loiown to the 

 Mexicans, but as I was not able to learn these names in all cases, I desig- 

 nated the bnttes by numbers in my notebook and Avill so refer to them, 

 now, adding .the correct name when possible. 



Number 1, Cabezon peak. This is prol)ably the finest butte in the 

 Moimt Taylor region, altlioi;gh Great neck, descril)ed on a later page, is 

 a close second. As stated in Major Dutton's report, the topographers 

 who ascended Cabezon found its altitude to be 2,160 feet above the valley 

 bottom. Its diameter is given as about 1,400 feet. A famous landmark 



FiiilRE 'i. — C'ale.roii, slunciiiri /•J.rpdKiiie of fiiirr<jiiii(liii!i liori-diiUil t>cdiiHciilf. 



for many years, it has been figured in several of the early exploration 

 reports. It is indeed a most striking feature in the landscajie, Avith its 

 dark shaft outlined against the sky or against tlie yellow sandstones of 

 the surrounding countrv. 



"We approached Cabezon from the east, our first good view of the peak 

 Ijeing that reproduced in plate 25, figure 1. From a point a few miles 

 nearer we .could see that the butte possessed fine vertical columnar 

 structure, and that down toward its base the columns in places curved 

 outward toward the periphery. The main tower rises above a circular 

 terrace of Cretaceous sandstones which appear to be horizontal, but 

 which are not Avell exposed on the east. The immediate base of the 

 tower is more or less obscured by a talus of broken columns. 



Continuing to the town of Cabezon, w-e obtained a fine view of the 



