\vKBi;i; PEAK. l(;i 



cross tilt' Alplia fault, at least the limestones aj^pear to have undergoiiu no 

 displacement. West of the Alpha displacement the course of the east and 

 west fault after passing Weber Peak is lost, being buried Ix'ueath the accu- 

 mulations of igneous rocks. 



The thickness of the Lower Coal-measures may be best estimated 

 south of Fusilina Peak, where the upper members of the epoch are deter- 

 mined by the jxtsition of the Weber conglomerate, and, although there ex- 

 ists no positive evidence that the beds resting on the AVhite Pine shale are 

 the equivalent of the lowest members found elsewhere, the>' i)rol)abl}' do 

 not belong far above the base. It is estimated that the limestones measure 

 about 3,800 feet in thickness. 



Organic remains may be foimd scattered throughout the limestone, but 

 nowhere were any grouping of species obtaineil which were of special in- 

 terest or which could lie regarded as the e([ui\alent of the Spring Hill 

 launa. .Vt the head of Newark (Janvon, which starts in near the base oi' 

 the limestone inuuediately resting on the AVhite Pine shale, were found 

 Produdus longispinus, P. semireticulatus, and Spiriferacaiiirmfa, while south of 

 Fusilina Peak, at the top of the horizon, the same species oc(;ur associated 

 with Fusilina cyUndrica and other Coal-measure forms. On the maj) will be 

 found a number of localities designated where fossils were procured but 

 they indicate only a few of the horizons where they are known to exist. 



Weber Peak and Pinto Springs Region.— Under tliis heading may be designated 

 the area of the Weber conglomerates lying between the two great bodies 

 of Carboniferous limestone, l^'rom Weber Peak southward they overlie 

 conformably the Lower Coal-measures, although not extending southward 

 out into the ojien valley quite as far as the limestone, being buried beneath 

 either basaltic flows or the alluvial deposits of Pinto Creek. Along the 

 line of contact the Weber conglomerates forn^ a well defined series of ndges 

 parallel with the Alpha and Fusilina ridges, the two formations standing out 

 sharply contrasted by their surface forms, atmospheric agencies acting quite 

 differenth' on the fine crystalline limestones and the coarse conglomerates. 

 In like manner erosion acting upon the more easily disintegrated cf>nglom- 

 erates has worn out a number of narrow drainage channels along the con- 

 tact which serve still more shar])l\- to define the boundaries. The conglom- 

 :\iON XX 11 



