166 GEOLOGY OP THE HIGH PLATEAUS. 



pied by the beds which Powell has called Bitter Creek, lying upon the 

 southern slopes of the Uinta Mountains. This determination does not rest 

 upon identical fossils, for the two localities do not yield the same species; 

 but upon the most decisive of all evidence, the known continuity of the 

 beds. Between the Bitter Creek beds of the Uintas and those here assigned 

 to the same epoch is an iinbroken exposure along which the identity can 

 be traced. The fossils found are Viviparus trocMformis (White), Hydrobia 

 Utahensis (White), several undetermined species of Physa, Planorbis, and 

 Limncea, and some plant remains. The total thickness of this series is 

 about 2,200 feet, but varies a little in different sections. The following sec- 

 tion was measured by Mr. E. E. Howell at the southwest angle of the plateau, 

 and very well represents the general character of the whole formation. 



Feet. 

 la) Shaly limestone, containing Physa, Limncea, and Planorbis 250 



[b) Gray and cream-colored limestone with Physa 400 



(c) Pale pink arenaceous limestone 250 



[d) Gray limestone, shaly and green at base, with Hydrobia, Physa, and Vivi- 



parus 350 



(e) Cream-colored calcareous sandstone 350 



(/) Gray limestone with Viviparits 600 



2,200 

 This series has been designated No. 3 in the various sections, and 

 though it has not been connected with the Lower Tertiary beds in the 

 southernmost of the High Plateaus its identity is probable in a high degree, 

 so much so that it is taken for granted. The beds which overlie it are 

 separated by a distinct plane of demarcation in the principal sections and 

 by lithological characters. They are much more variable in their constitu- 

 tion and in their bedding. Its members are designated as series No. 2, and 

 the following sections by Mr. Howell illustrate their characters : 



Series So. 2 (Tertiary), section Xo. 7 A: Feet. 



(a) Cream to gray shaly limestone, with fishes, Planorbis, Viviparus, and indistinct 



plant remains 350 



(b) Greenish calcareous shale 750 



(c) Pale red, purple, and slate-colored marls, with occasional bands of calcareosu 



gray sandstone, fish-scales being found in some of the more calcareous 

 members 400 



1,500 



