332 E. M. KINDLE RECONNAISSANCE OF PORCUPINE VALLEY 



The Carboniferous and Devonian series have not been seen in contact 

 in an}' of the Porcupine Eiver exposures, so that their relations are not 

 known from actual observation. They are probably conformable, how- 

 ever, as they are in the Yukon Kiver section. It is not definitely known 

 by what beds the Carboniferous series are succeeded. Careful examina- 

 tion of the section has failed to discover any evidence of the presence of 

 beds of Mesozoic age, and they are believed to be absent. The only beds 

 of Paleozoic age which have been observed in contact with the Carbon- 

 iferous rocks are lavas, probabty of Tertiar)' age, which overlie them 

 unconformably. 



CARBONIFEROUS FAUNAS 



Doctor Girty's report on the several faunules from the Porcupine 

 Lower Carboniferous as developed below the Upper Eamparts is as fol- 

 lows: 



"This fauna appears to be closely related to that obtained on tlie Yukon at 

 Calico bluff, and I believe that the beds containing them may be correlated. 

 This Porcupine fauna, somewhat more than the other, contains suggestions of 

 the earlier faunas of the Mississippian, and it appears possible that the whole 

 of Mississippian time is represented. The following lists show the species 

 occurring in this group : 



Stations between Indian 



No. 28 : 

 Zaphrentis sp. 

 Ghonetes sp. 



Productus aff. cora D'Orbigny. 

 Product us aff. coiicentricus Hall. 

 Productus sp. 

 Spirifer aff. tisulcatus Sowerby. 



No. 28A : 



Productus n. sp. 



Spirifer aff. bisulcatus Sowerby. 



Martinia sp. 



Reticiilaria aff. setigera Hall. 



No. 28B. 

 Productus aff. setiger Hall. ? 



No. SOB : 



Zaphrentis 2 spp. 

 Syringopora sp. 

 Schuchertella aff. Jens White. 

 Ghonetes aff. illinoisensis Worthen. 

 Productus semireticulatus Martin. 



Village and Lower Ramparts 



Spirifer sp. 

 Martinia sp. 

 Aviculipecten sp. 

 Euomphalus sp. 

 Ostracoda undet. 

 GriffltJiides ? aff. 

 Worthen. 



hufo Meek and 



Pugnax aff. missouriensis Shumard. 

 Pugnax ? sp. 

 Dielasma sp. 



Productus aff. alternatus Norwood 



and Pratten. 

 Spirifer aff. hlsulcatus Sowerby. 

 Rhijnchonella sp. 

 Gonocardium 1 sp. 

 Phillipsia sp. 



