54 SEDIMENTARY GROUPS OF THE PLATEAU PROVINCE. 



VERMILION CLIFF GROUP. 



The wagon road from Toquerville to Paria, a little town on the Paria 

 River, soon after climbing 1 the Hurricane Ledge reaches the foot of the 

 Vermilion Cliffs, and continues at this geological horizon until it commences 

 to descend into the valley of the Paria. For seventy-five miles the road 

 lies under this great ledge, whose salient buttes, deep alcoves, terraced and 

 buttressed walls, towering pinnacles, all brightly colored in orange, vermilion 

 and purple, and dotted here and there with straggling cedars and nut pines, 

 constitute a grand panorama to the passing traveler. 



Flaming Gorge on the Green River is cut through beds of this group 

 and receives its name from the bright colors of vermilion sandstone ; Laby- 

 rinth Cailon is cut through vermilion sandstone ; Glen Canon for the greater 

 part of its course also, and fine exposures are seen along the Colorado 

 Chiquito. 



SHINARUMP GROUP. 



South of the Vermilion Cliffs a low ledge or escarpment is seen capped 

 with conglomerate. This is the Shinarump Conglomerate. 



The variegated beds above and below the conglomerate are seen in 

 many places on either flank of the Uinta Mountains, and from time to time 

 this horizon is brought up by faults or flexures in all the stretch of country 

 which intervenes between the Shinarump Cliffs and the Uinta Mountains. 



UPPER AUBREY GROUP. 



Mr. Gilbert, as geologist of the Wheeler expedition, described certain 

 groups of limestones, sandstones and shales as the Aubrey Group. Previous 

 to his publication I had in manuscript divided these beds into two groups 

 and given them names ; but in carrying out my determination to use the 

 names of groups which had been adopted by others so far as such names 

 were available, I have decided to call the two groups into which I wish to 

 divide the Aubrey beds of Mr. Gilbert, the Upper and Lower Aubrey 

 Groups. 



The beds of the Upper Aubrey are exposed for thousands of miles 

 along the Grand Canon of the Colorado and its lateral canons, everywhere 



