EAST CANON CREEK. 383 



unconformable with tlie Eocene beds, which appear round their northern and 

 eastern flanks, being- nearly horizontal, while the Cretaceous rise through 

 them with a dip of 25°. The relation in this region between these three 

 sets of unconformable strata, those from the Jurassic down, the conglomerate 

 ridge, which has been referred to the Cretaceous, and the horizontal Ter- 

 tiary, is much obscured by the enormous accumulations of debris and soil, 

 and the ideas of non-conformity are to be arrived at rather by stratigraphi- 

 cal position than by acutal contact. 



A short distance below Parley's Park, East Canon is cut for a mile 

 and a half through Cretaceous beds, which strike about east and west, and 

 dip in the lowest member 60° north, shallowing somewhat down the stream. 

 The uppermost beds exposed are gray and cream-colored sandstones, inter- 

 stratified with conglomerates, which form the summit of the upper mem- 

 bers of the Colorado group. Fossils obtained from the sandstone here are 

 of an altogether new specie^, and are of little value for identifying the exact 

 horizon. They are, however, purely Cretaceous in type, and comprise the 

 following forms, which have been described by Prof. F. B. Meek : 



Cyprimeria fsuhalata. 



Tellina modesta. 



Tellinaff isonema. 



Mactra [Cymhophoraf) UtaJiensis. 



Mactraf JEmmonsi. 



CucuUcea i^Trigonarcaf) obliqua. 



The ordinary black shales of the Colorado group appear here in a 

 very limited way, owing to the surface being deeply covered with earth; 

 the sandstone and marls of this group outcrop very distinctly, leaving 

 deep, soft valleys between them, which doubtless represent the soft shaly 

 members ; in several instances, sharp shale ravines, cut by recent erosion, 

 display these black unctuous shales. Higher up the canon, under the shales 

 and sandstones, may be seen the coarse grits and conglomerates of the 

 Dakota group, dipping niore steeply north, and overlying the variegated 

 shales and soft calcareous sandstones of the Jurassic, mth no observed 

 unconformity of dip. 



