CARBONIFEROUS 



33.5 



No. 37C : 



Cleiothyris ? sp. Pteria ? sp. 



Aviciilipecten aff. rectilaterarius Cos. Ostracod uudet. 

 Aviculipecten aff. eurekensis Walcott. 



No. 39A : 



Lingula sp. 



Derhya sp. 



Chonetes aff. platynotus White. 



Pwdiictiis aff. ffrneneicahlti Krotow. 



Productus aff. icallacei Derby. 



Productus aff. cora D'Orbigny. 



Productus aff. Huml)oldti D'Orbigny. 



No.39Abis: 

 Euomphalus sp. 



Productus aff. humboldtl D'Orbigny. ? 

 Spirifer aff. caincratus Martin. 

 Spirlfer aff. schellwieni Tscherny. 

 Hustedia aff. mcckaiia Sbumard. 

 Seminula aff. mexicana Hall. 

 Rliynchppora sp. 



Diclasnia aff. millepunctatum Hall. 

 Aviculipecten sp. 



No. 39D : 



Zaphrentis sp. 



Chonetes sp. 



Productus aff. aagardi Toula (same 



as No. 36). 

 Spirifer aff. rectangulws Kut. 



Squamularia aff. guadalupensis Shu- 



mard. 

 Aiiihocoelia sp. 

 Rhynchonella ? sp. 

 Macrodon sp. 

 Pleurotomaria ? sp." 



EXTEKT OF THE CARBONIFEHOVS IN NORTHERN ALASKA 



The stations which Doctor Girty reports to show an Upper Carbon- 

 iferous fauna (39 A and 39 C) are located between the lower end of the 

 Upper Ramparts of the Porcupine and the elbow of the river 1 mile 

 below the mouth of the Salmontrout. Girt3^'s conclusion that the fauna 

 is Upper Carboniferous and younger than the other Porcupine Carbon- 

 iferous stations is in harmony with the observed stratigraphy. The sta- 

 tions represent a practically continuous belt of Carboniferous shales and 

 limestones, except where interrupted by the post-Paleozoic basalts, about 

 5 miles wide along the river, which is separated from older beds on each 

 side by faults. Evidence of faulting may be seen on the east side of this 

 belt just below the Indian village, on the north bank of the river, and on 

 the west side at the last outcrop of the Carboniferous series. The beds 

 on the east side of this belt are known to be Devonian, and those on the 

 west side are believed to lie Devonian also. This Carboniferous series, 

 according to Doctor Girty's determinations, represents -a portion of the 



