410 DESCEIPTIVE GEOLOGY. 



bly overlaid by the beds of the Ute limestone. The line of junction at the 

 top of the series, to the west of Ute Peak, between the Ogden Quartzite 

 and the Silurian limestone, has not been well determined; but, as the entire 

 western face of the mountain comes within the limits of the formation, it is 

 evident that there are exposed here a thickness of not less than 2,000 feet of 

 Silurian beds, which, from palseontological evidence, have been referred 

 without hesitation to the Quebec group of Canada. As, however, the beds 

 containing Quebec fossils are still overlaid by a considerable thickness of 

 calcareous strata, the Ute limestone may yet be found to contain beds be- 

 longing to the Upper Silurian formations. Within the 2,000 feet of exposed 

 strata of Ute Peak, there is presented a very great variety of lithological 

 characters, dark, nearly black, compact limestones, coarse granular, lighter- 

 colored beds, carrying greater or less thicknesses of calcareous and argilla- 

 ceous shales, sandstones, cherts, and grits, in color varying from black to gray- 

 ish-white, with intermediate shades of blue. Occasionally, some of the 

 finer-grained homogeneous beds develop a striped and banded mode of 

 weathering. In general, it may be said that the beds are characterized by 

 less uniformity of texture and color, while the arenaceous and cherty beds 

 predominate over the purer limestones to a greater extent than is the case 

 in the Wahsatch limestone. 



Within 25 feet of the base of the series occurs a body of calcareous 

 shales, interstratified with narrow beds of a dark, fine-grained limestone, 

 which is filled with abundant remains of Entomostracea, containing new 

 species of at least two genera : 



Bikellocephalus quadriceps. 

 ConocepJialites subcoronatus. 



Two hundred feet above these beds, in a compact cherty black lime- 

 stone, on the north side of the peak, was found an undetermined species 

 of the genus Obolella. From the upper bluffs, some 200 feet below the 

 summit of the ridge, in a coarse, gray, granular limestone, were found : 



Euomplialus (BapMstoma) rotuliformis. 

 Euomphalus {Baphistomd) trochiscus. 

 Maclurea minima. 



