FAUNA OF THE POGONIP. 51 



A number of localities southeast of Rubv Hill represent, intJieir fauna, 

 a somewhat higher horizon, the most favorable for collectin<>- l^eing found 

 on the first ridge southeast of the Jackson Mine, where the l)ase of the 

 Pogonip beds are wanting, ha^ang been cut off b}- the Jackson fault. 

 These beds yielded the following species : 



Lingulepis iiiiera. Ptychoparia (Euloiiiii) aflfiuis. 



Lingiila inanticiila. Aiethusiiia aiiu'ricaiia. 



Acrotrcta gemma. Illa'iiurns curekeiisis. 



LeptaMia melita. As;iplms cariboucusis. 



Oitbis hamburgensis. Asaphus (sj). uiidt.). 



Directly east of the Ilambiu-g Ridge and several hundred feet above 

 the last locality, a grouping of fossils comes in which is characteristic 

 of a slightly higher horizon : 



Liiigulei)is ma-ra. Tiiplesia (talcifera. 



Lmgula inauticiila. Telliuomya? liambiugeusis. 



Disciiia (sp. iiudt.). Dicellocepbalus fiualis. 



Acrotreta gemma. Dicellocephalus iiiexpectaiis. 



Schizambou tj^iiealis. Ptyclioi)aria aimectans. 



Obolella ambigua. PtvdiDpai'ia oweiii. 



Orthis liambni'geiisis. Ampliioii (sj). undt.). 

 Ortliis testudiiiaria. 



This horizon may be easily identified by collections of fossils more or 

 less complete from numerous other localities in the district. Fronj about 

 this [)oint in the limestone the older persistent forms gradually disappear, 

 and the new species introduced in the above list become more and more 

 al)undant, as is evidenced by the increasing number of localities where they 

 occur as higher strata are reached. 



In a compact gray limestone southwest of JlcCoy's Ridge are the fol- 

 lowing : 



Orthis peiveta. Phimulites (sp. luidt.). 



Ortlds testmlinaria. Coraurus (sp. uudt.). 



Trijtlesia calcilera. Ilhviiurus euiekensis. 



Maclurea aimulata. Asai)luis cariboucnsis. 



^fidMiU' in the Pogonip, the genera Receptacuides, ('h(ctete>i, Pleuroto- 

 marki, Madurca, Bathijuruti, Asaphus, and Cijphaspis, make a decided claange 



