THE JURASSIC SEEIBS. 



151 



tion between them gradually fades, and the two seem to merge into one. 

 Neither of them have yielded any determinable fossils. Nevertheless, 

 I am convinced that the probable plane between the Jura and the Trias 

 lies between these two sandstones. In the Uinta Mountains the Triassic 

 sandstones have the same general features as they exhibit upon the south- 

 ern flanks of the High Plateaus. Comparing the Jura-Trias section of the 

 Uintas with that of the High Plateaus and Kaibabs, we find a concordance 

 in the several members. 



A comparison of these two sections will lead to the conviction that the 

 white sandstone of the Kanab region is identical with that of the Uintas. 

 But the latter has Jurassic fossils above and below it, and hence we may 

 conclude that the former is also Jurassic, although fossils of that age are 

 found only above it, and none of an}* kind either in the sandstone itself or 

 in the thin shales below. 



Starting from the village of Cedar, west of the Mark^igunt, we find the 

 sandstone in great force, and may trace it southward around the flank of 

 that plateau, and thence eastward around the Paunsdgunt, and beyond the 

 Paria River. In the Kaiparowits it is wholly lost beneath the Cretaceous, 

 but east of the Kaiparowits it reappears. It skirts the southern and east- 

 ern slopes of the Aquarius, and is grandly displayed in the Water-Pocket 



