382 ransome: the ray quadrangle 



vitreous quartzite, in an arkosic matrix. The pebbles are gen- 

 erally less than 6 inches in diameter although there are some 

 8 inches across. Although beautifully rounded, they are not 

 rotund but are flat ellipsoids or round-edged disks. Small frag- 

 ments or pebbles of bright red jasper, while nowhere abundant, 

 are a very characteristic and constant feature of this conglom- 

 erate. The only rocks known that might have furnished these 

 red fragments are certain hematitic jaspers associated with schist 

 in the northern part of the Mazatzal Range, about 70 miles 

 north-northwest of Ray. The matrix of the conglomerate pebbles 

 is arkosic. 



In the Ray quadrangle the Barnes conglomerate varies from 

 10 to 40 feet in thickness. Near Roosevelt it is from 15 to 20 

 feet thick. 



This conglomerate is very constant in character and has a 

 wide distribution. It has been identified in the Sierra Ancha 

 to the north, and in the Santa Catalina Range to the south, the 

 two localities being about 80 miles apart. 



Th ^ occurrence of a deposit of this character overlying shale 

 is itself indicative of unconformity. Beyond the inference that 

 may be drawn from this relationship however, no evidence of 

 unconformity has been detected. 



Dripping Spring quartzite. Confoimably overlying the Barnes 

 conglomerate is a formation of quartzite and quartzitic sand- 

 stone from 400 to 500 feet thick in the Globe-Ray region. In 

 the Globe report the name Dripping Spring quartzite was applied 

 not only to this formation but also, through error, to a similar 

 stratigraphically higher quartzite whose distinctness from the 

 lower quartzite was not recognized in the intricately faulted 

 area of the Globe quadrangle. The name Dripping Spring 

 quartzite is here redefined as that formation which overlies the 

 Barnes conglomerate and underlies what will presently be 

 described as the Mescal limestone. 



In the Ray quadrangle, approximately the lower third of the 

 formation consists of hard fine-grained arkosic quartzite which, 

 as seen in natural sections, shows no very definite division into 



