EED CREEK QUARTZITE. 



139 



seen; while from two to three thousand feet of the upper members of the 

 Uinta Sandstone were deposited over the summit of the quartzite. 



From these facts we may safely infer that this was a great headland of 

 quartzite standing- out in the old Uinta Sea from some island, or perhaps 

 from the mainland ; that it rose above its waters as a lofty mountain, while 

 from two to three thousand feet of these sandstones, whose junction with 

 the quartzite is unseen, and while 8,000 feet of sandstone whose junction is 

 seen, were deposited. Then this mountain headland was buried with two 

 or three thousand feet of the upper members of the Uinta Group. During 

 that great movement which began during Cenozoic time, and which has con- 

 tinued intermittantly unlil the present, and which has given us the Uinta 

 upheaval, this quartzite behaved in a general way as an integral part of the 

 sandstone, flexing when the sandstone flexed and faulting when the sand- 

 stone faulted. In the upper part of Figure 11 we have a diagram exhibiting 



U. Uinta Group. K. Red Creek Quartzite. C. Cretaceous. 



Fig. 11. Section and diagram of the Red Crock Unconformity. 



the relation of these two groups as now seen ; the lower part of the same 

 figure represents a restoration of the same section to the position these two 

 groups held prior to the inception of the Uinta upheaval. It will be seen 

 that the old shore line, in vertical outline, was now a bold cliff against which 



