118 GEOLOGY OF THE ETJEEKA DISTEICT. 



On PI. n, Sec. 4, there is shown for comparative purposes a section 

 across the highest point of Prospect Peak where the quartzite reaches the 

 very summit of the ridge. On Prospect Peak the strata stand at an angle 

 of nearly 70, whereas on Ruby Hill and Adams Hill they lie inclined at 

 about 40. 



Paleontological evidence that the Ruby Hill series of beds are the 

 precise equivalent of those found 011 the east side of Prospect Ridge is 

 ample for all purposes of identification. Three well defined horizons are 

 recognized yielding the same organic forms which characterize identical 

 strata elsewhere. The lowest of these three horizons is found not far below 

 the summit of the Prospect limestone, the middle one near the base of the 

 Hamburg limestone and the upper one near the base of the Pogonip. 



Fossils in Richmond Mine. In a compact stratified limestone on the seventh 

 level of the Richmond Mine a sufficient number of organic forms were 

 found to identify the beds with the upper members of the Prospect Moun- 

 tain limestone, and locating beyond all question the geological position of 

 the ore bodies. The species collected were: 



Lingula manticnla. Agnostus neon. 



Agnostus communis. Agnostus richmoiidensis. 



Agnostus bidens. Ptychoparia oweni. 



At the base of the Hamburg limestone opposite the Richmond dump, 

 and again north of the Albion mine, species have been identified correspond- 

 ing to those obtained in New York Canyon and Secret Canyon just above 

 the great shale body. North of the Wide West ravine a small grouping of 

 forms correlates the limestone just above the shales as the base of the 

 Pogonip, showing the mingling of the Cambrian fauna with a grouping of 

 fossils which higher up in the beds becomes characteristic of the Pogonip. 

 The two species Obolella discoidea and DiceUocephalvs marica, occurring in the 

 Pogonip elsewhere, have been collected from the limestones north of the 

 Wide West ravine. 



FISH CREEK MOUNTAINS. 



Fish Creek Mountains. These somewhat isolated mountains lie to the south- 

 west of Prospect Ridge. They are surrounded on three sides by the ever- 

 present sagebrush valleys of Nevada, but to the northward maintain their 



