returned north to Oottonwood PasB, stopped, for tvfo hours at 7600 feet 
on the west side of the pass and then continued on to Crystal where caop 
was made for the night. *ln July 4 wo continued on, making a second brietf 
examination of hed Lake and camped at waterholes in an arroyo east of the 
rock formation known as the haystacks, 8 miles oast of Fort Defiance, 
'Arizona and within the flew ;iexlco boundary line. On J41y 6 we continued 
to Gallux.), flew ilexico. 
PHYaioGhAPHX and GaNKIUtL ACOOUIJT. 
The Chusoa Hoimtains lie in nortliwestem flew itekloo near the Arizona 
line and are included within the lioiits of the flava^o Indianaheservation. 
The part of this momitain range covered in the present report extends from 
Cottonwood Pass six miles north of Crystal New Uexico south to the south- 
ern end of the range. (The wagon road that crosses at Cottonwood Pass is 
not shown on the Geological durvey sheets.) The sunmit of the mountains 
here is a great undulataug mesa that lies in the main at 8800 feet above 
sea level with points at Intorvalb rising to 9000 feet. The postion of this 
mesa examined In the present connection comprises an area about ID miles 
4 
long and from one to three miles broad. The mountain extends in a general 
way from northwest to southeast. 
The underlying rook of the sunmit of the mesa is a fine-grained 
light colored sandstone that where exposed breaks readily into thin slabs 
from half an inch to two inches thicx. The bods of this sandstone have a 
I 
dip of about 30 degrees to the northwest while the strata are tilted some- 
what to the east. This formation forms low ridges running in general across 
the mesa from east to west with lower areas betr/een, the surfaces of which 
are diversified by many hollows of varying size. These hollows form the 
