KEGION BETWEEN BEAR x\ND WEBER RIVERS. 335 



ranges, in a general northeast direction. Were it not for the overlying 

 trachyte and Tertiaries, the structure would undoubtedly be found to be 

 this : Along the north flank of the Uinta, the Cretaceous would seem to be 

 uplifted in conformity all the way with the Jurassic. This relative position 

 is maintained eastward across Parley's Park, or, in other words, as far as the 

 actual influence of the Uinta is felt. From that point, in contact with the 

 earlier upheaval of the Wahsatch, the Cretaceous would be seen to be uncon- 

 formable with the Jurassic ; while between these two ranges, and occupying 

 a resultant direction, would be observed a large anticlinal fold, with a 

 northeast direction, whose rocks would pass down from its northern side 

 with a northwest dip, and rise under the synclinal axis of Echo City, devel- 

 oping themselves between that point and Lost Creek ; while on the south- 

 east side of the fold they would pass imder the synclinal, which is indicated 

 in the local fold below Kamas, and rise again against the flanks of the Uinta. 

 The positions exposed in Weber Canon, Chalk Creek, Echo Canon, and, as 

 will be later seen. East Canon Creek, entirely coincide with this reconstruc- 

 tion of the underlying structure. The winding strike which is observable 

 for 10 or 12 miles in the Cretaceous beds to the east of Coalville is doubt- 

 less due to longitudinal compression. But besides this flexure in the strike, 

 thej are further complicated by a series of northwest faults, which have 

 given rise to horizontal, as well as vertical, displacements. There is one 

 broad block of country, included between two northwest faults, that seems 

 to have been moved to the southeast. This faulting is quite complicated, 

 and it is difficult to match the sides, owing to the duplication of similar 

 beds of buff sandstone nonnally above one another in the series. 



From the horizon of Coalville downward are, as exposed up Chalk 

 Creek, a series of alternating dark shales and buff and gray sandstones, 

 with a few yellow marl beds. At various points in this series, notably at 

 Coalville, were obtained marine fossils, among which the following have 

 been described by Prof. F. B. Meek : 



Cardium suhcurtmn. 



Anchura f fusiformis. 



Mactra (Oynibophora)f Utahensis. 



Ostrea Wyomingensis (Coalvillensis). 



Corbula, undet. sp. 



