THE CENOZOIO GKOUPS. 



some places these rocks are composed of thin laminae of many delicate 

 colors, but they do not readily part along the planes of stratification, but 

 crumble easily and often break in large masses. Extensive beds and irregu- 

 lar aggregations of chalcedony are found and I suppose them to have been 

 deposited by precipitation. Conglomerates are found, at the base, in some 

 localities having a great development. The beds incline slightly from the 

 wall of the park on the south side ; this inclination may be due to the bottom 

 on which they were deposited.- On the north side the beds are turned up at 

 a great angle, showing much displacement since they were deposited, and 

 immediately outside of the irregular line of outcrop a fault has been observed 

 with its throw to the south. 



In Brown's Park the streams which come down from the mountains on 

 either side have in many places cut through these beds and reveal in the 

 depths of their channels the old floor of Uinta Sandstone. But a few hun- 

 dred feet of these beds are left in Brown's Park, but eastward a much greater 

 thickness remains preserved from denudation. It is probable also that this 

 greater thickness is due in part to greater sedimentation. 



In the northeast portion of the Po Canon district there is another out- 

 crop of this group. Here the beds rest unconformably. on the Uinta Sand- 

 stone, the several Carboniferous groups, the several Mesozoic groups, on 

 Bitter Creek beds, and also on the heterogeneous mass of sandstones of 

 which Diamond Peak is composed. 



BISHOP MOUNTAIN CONGLOMERATE. 



This conglomerate is found only in isolated patches as remnants adven- 

 titiously preserved from the general erosion to which this widely spread 

 formation has been subjected. 



An outlying patch or fragment is found on the north side of Sage Creek 

 overlying unconformably the beds of Lower Green River age. Another is 

 found on the plateau where Sage, Little Bitter, and Pretty Creeks have their 

 sources; here the conglomerate rests on Point of Rocks beds. Another is 

 found on the summit of Quien Hornet Mountain resting on Lower Green 

 River beds. Another is found on Bishop Mountain resting on Bitter Creek 

 beds. On the south side of the Uinta Mountains a fragment is found west 



