of the Bear River Formation. 107 



From the facts just given in detail the following deductions 

 are made : 



1. The latest strata embraced in Meek's section on Sulphur 

 Creek are not those of the Bear River formation as he sup- 

 posed but are the dark shales, No. 1, at the east end of that 

 section which occupy a syncline between Hilliard and Bear 

 River City. 



2. Between Nos. 13 and 14 of Meek's section or perhaps 

 within the space No. 13, a reversed strike fault along the axis 

 of a sharp anticlinal fold has brought Jurassic strata in contact 

 with the eastern belt of fossiliferous Bear River shales, conceal- 

 ing the intervening beds. 



3. These recognized Jurassic strata are overlain by a con- 

 siderable thickness of conglomerates, sandstones and shales of 

 which the age is not known, though for stratigraphic reasons 

 they are doubtfully referred to the Dakota. 



4. The Bear River formation rests on the last mentioned 

 beds and as just indicated is conformably overlain by the shales 

 and sandstones of the Colorado Cretaceous. 



It will be seen that the facts obtained at other localities tend 

 to confirm these conclusions. 



The Area seven miles north of Evanston. — From Evanston 

 northward along the east bank of Bear river for five or six 

 miles the hills consist of reddish brown conglomerates, sand- 

 stones and shales at the top underlain by lighter colored sand- 

 stones with shales and heavy beds of coal (the Almy mines), 

 all dipping 10° to 15° southeast. Dr. White in his later writ- 

 ings refers all of these beds to the Wasatch while Mr. Emmons 

 and others have regarded the coal as belonging to the Laramie. 

 A short distance north-northwest of the most northerly of the 

 Almy coal mines is a hill composed of the characteristic shales 

 of the Bear River formation with very many fossils, including 

 almost all the species found in that formation at Bear River 

 City. The beds are exposed for a mile or more northward 

 parallel with the course of the river. They have about the 

 same, or in some places a less dip than the coal-bearing series, 

 with which they have no other characteristic in common. The 

 contact between the two formations is concealed in a valley 

 where there is probably a fault. On the west slope of the hill, 

 adjacent to the river valley, the Bear River shales are uncon- 

 formably overlain by soft reddish brown sandstones and shales 

 of the Wasatch Tertiary, dipping west, so that both the top 

 and the bottom of the Bear River beds are effectually concealed. 



It is worthy of note that about six miles north of this locality 

 a high ridge of Carboniferous limestone is brought up by a 

 fold the axis of which if prolonged would pass a little west of 

 the Bear River exposure. The conditions observable in this 

 area, however, throw comparatively little light upon the ques- 

 tion of the taxonomic position of the Bear River formation. 



