(JIJAYS PEAK. 13:3 



obli(Hi('l\-, with ;i[)proxiinat('l\' the sainc strike as the strata on Soutli Hill. 

 In tliis southern extension tlie onlv fossils ohtaineil were Cliactctrs and a.s- 

 sociated corals so abundant in the Lower Nevada linie.stone. 



Grays Peak.— This name has l)een <>-iven to the flat topped sinuniit which 

 forms the eastern limit of the broad (piartzite platean. It ofters a command- 

 ing- view, as the country falls oti' rai)idlv to the .south and east. On the 

 sunnnit the beds lie nearly horizontal, l)ut break awav al)ruptlv and dip 

 off in every direction accompanied by mural-like escarpments produced li\- 

 a series of small j)arallel faults lying- whollv within the (piartzite. On the 

 eastern side the .slope descends for nearly 1,000 feet, with an average dip 

 of 20', the angle of the slope and the inclination of the beds coinciding 

 witliin 1° or "2°. South and east the quartzites are overlain by the Nevada 

 limestones which dip away from the peak with varying angles. ( )n the east 

 side the line of contact between the two formations is strongly marked 1)V 

 a deeph' eroded ravine draining mto Grays Canyon. While these lime- 

 stones have been referred to the Nevada period, it is by no means definitely 

 ascertained that beds which in other places have l)een assigned to tlie Lone 

 Mountain series may not here, in some instances, rest upon the (juartzite. 

 Li many instances there is an entire absence of bedding, and in others the 

 strata n^st unconformably upon the (piartzite. A|)parently the underlying 

 limestones belong to the transition series between well rec(_)g-nized Silurian 

 and Devonian, but pass rapidly into limestone which has everywhere else 

 in the district been assigned to the Nevada epoch. These lime.stones stretch 

 awa\- to the south in insigniticant monotonous hills and ridges of loAver 

 Devonian age and have as yet yielded only a few obscure^ corals of wide 

 vertical range. North of (xrays Peak on the plateau where the beds lie 

 either horizontally or at low angles, there are several patches of limestone 

 still left in place as remnants of erosion. These exposures resemble the 

 beds of the Lone Mountain series and serve to show b\- their geological 

 position that the tpiartzites on the ridge l>elong to the upper memliers of 

 the Kureka epoch. To the westward of these Silurian limestone ])atches 

 the (piartzites break down in abrupt walls and clitls toward Lamoureux 

 Canyon much in the same way as seen ou the east side of Grays Peak. 

 Along- Lamoureux Canyon, however, the wall is most persistent, continuing 



