38 TRANSACTIONS OF THE 
The strata are colored red, green, white, and purple, with 
here and there great blotches of a brilliant red. Seen 
from a distance, they certainly present a striking appear- 
ance. 
The conglomeritic nature is most prominent on the 
western exposure, but toward the east the strata lose more 
or less of this character, and in places become simply 
variegated marls. In a few places, for instance, two miles 
and a half west of Cliff Siding, Emery County, the siliceous 
portion, at the base contains fragments of trees. These 
are the only evidence of plant life found in the Jurassic in 
this region. In several of the siliceous pebbles I have 
found crinoid stem plates, which seem to indicate a land 
area (probably Carboniferous) to the west, in the vicinity 
of the present Wasatch Range. 
Just a word here as a comment on the foregoing. In 
the first place I wish to draw attention to the lower de- 
limiting line of the Jurassic. At present I have preferred 
placing it at the base of the heavy massive sandstone, as 
it appears to me that this whole one thousand six feet of 
sandstone, regardless of the cross-bedding of the upper por- 
tion, is a unit. Powell calls the cross-bedded portion the 
White Cliffs formation, and the lower portion the Ver- 
million Cliffs and the red arenaceous shales immediately 
underlying, the Upper Shinarump. It may be that the 
White Cliff Formation is stratigraphically the same as the 
La Plata formation in Southwestern Colorado. If this be 
true then the series underlying them down to the base of the 
lower conglomerate will be the Dolores of the same locality 
and consequently of Triassic age. 
The Middle Jurassic as here outlined, is the same as 
Powell’s Flaming Gorge group and corresponds with it 
both lithologically and paleontologically. 
The Upper Jurassic agrees very well with the Mor- 
rison formation both lithologically and paleontologically 
as is evidenced by its variegated appearance and contained 
Allosauri. If this is correct then it will share the fate of 
these beds, which according to Marsh are placed at the 
top of the Jurassic, and according to Emmons, Cross, and 
