NORTHERN BEAR RIVER REGION. 339 



wtile interlaminated in the series are strata of fine brownish-gray argilla- 

 ceous sands and marls. On the divide between Saleratns and Lost Creeks, 

 the beds have a somewhat coarser character, with a deeper red color, the 

 steep slopes of Lost Creek resembling closely the conglomerate walls of 

 Echo Canon. Similar beds are found along the ridge of Red Creek, form- 

 ing the divide between it and Lincoln and Duck Creeks, but of somewhat 

 finer material, and covered with considerable vegetation. 



On the western edges of this great Tertiary plateau are found expos- 

 ures of underlying Palaeozoic and Mesozoic beds, which, as belonging to 

 the great fold of the Wahsatch Eange, will be described further on. 



