E. M. Kindle — Section at Cape Thompson^ Alaska. 527 



In the upper part of the lowest division of this thick lime- 

 stone series, a of the section, fossils are fairly abundant, and 

 represent about the same species as found at 14 D 1 . Only a 

 few were collected, however. These are given in the follow- 

 ing list by Dr. G-irty, whose remarks on the general faunal 

 relations of these faunas have already been given. 



Lot 15 A. 



Zaphrentis sp. 

 Spirifer off. striatus 

 Composita? sp. 



The close physical resemblance of the second division (b) of 

 the limestone series to the lower leaves little doubt that it is also 

 of Carboniferous age. It may represent the Upper Carbonifer- 

 ous, which has not been recognized anywhere on the north- 

 western coast of Alaska, though known on the Yukon and in 

 southeastern Alaska. 



The lithologic change at the top of this limestone series is 

 abrupt. The beds included in c and d are essentially similar, 

 and represent the same formation, although there is less of the 

 calcareous element in the lower beds. Fossils were found, 

 however, only m the upper beds marked d in the section. 

 They occur in great abundance in certain strata in this portion 

 of the section. About seven feet near the top are composed 

 almost exclusively of shells which have been largely altered to 

 chert. Dr. T. "W". Stanton has furnished the following report 

 on the fossils secured from this horizon : 



" Lot lod. Mouth of creek 2 miles southeast of Cape Thomp- 

 son. 



This collection consists of limestone fragments with numerous 

 specimens of aviculoid shells referable to JPseudomonotis subcir- 

 cularis (Gabb) or to a closely related species. No other recogniz- 

 able species are associated with it. This species occurs in an 

 Upper Triassic horizon in California, and it has been accepted as 

 sufficient evidence for the Triassic age of rocks containing it at 

 Cold Bay and in the Copper River region of Alaska. In my 

 opinion, the horizon which yielded it at Cape Thompson is also 

 Upper Triassic. 



Among the collections obtained by Mr. Collier in the Cape Lis- 

 burne region some years ago there are several small lots consist- 

 ing mainly of a form that seems to be identical with Pseudomo- 

 notis subclrcularis and probably comes from about the same 

 horizon as this Cape Thompson locality. These fossils were at 

 that time identified as Aviculopecten and referred to the Carbon- 

 iferous, chiefly because of the stratigraphic relations they were 

 supposed to hold with well-characterized, Carboniferous faunas. 

 If Mr. Kinclle's interpretation of the structure is correct the hori- 



