714 G. C. MARTIN- — TRIASSIC ROCKS OF ALASKA 



at the north end of Vancouver Island, Avhere Dawson has described 52 

 flaggy limestones, calcareous argillites, black flinty argillites, etcetera, 

 which overlie a massive limestone and are overlain by sandstones, above 

 Avhich are volcanic beds. The section is closely similar to that of the 

 Queen Charlotte Islands. The fossils from the flaggy limestones and ar- 

 gillites were described 53 by Whiteaves as including the following species : 



Halobia (Daonella) lommeli ? (extreme local variety). 



Arcestes gabbi Meek. 



Amiotites vancouverensis Whiteaves. 



Amiotites sp. 



Amiotites or Celtites sp. 



It has been generally assumed that these fossils are Middle Triassic, 

 which would undoubtedly be the case, at least for the Daonella and the 

 Arcestes, if the species have been correctly determined. It was the opin- 

 ion of Freeh 54 that the ammonites described as Amiotites are also in- 

 dicative of Middle Triassic age, "Amiotites vancouverensis" probably 

 being a Celtites, "Amiotites or Celtites sp." being a Celtites related to 

 C. epolense Mojsisovics, and "Amiotites sp." being a Ceratites related to 

 C. japonicus Mojsisovics. 



The writer doubts whether any of these fossils from Vancouver Island 

 are Middle Triassic and believes that it is highly probable that they are 

 all Upper Triassic. The reasons for this belief are as follows : Whiteaves 

 expressed considerable doubt concerning the identification of Halobia 

 (Daonella) lommeli and considered that 55 the Vancouver Island speci- 

 mens "may possibly represent an extreme local variety of this species." 

 He recognized the same "extreme local variety" as occurring in associa- 

 tion with Pseudomonotis subcircularis in the flaggy limestones and argil- 

 lites of the Queen Charlotte Islands. This form is probably identical 

 with neither Daonella lommeli Wissman of Europe nor Daonella dubia 

 Gabb of Nevada, but is more likely an Upper Triassic species of Halobia. 

 The fossils identified by Whiteaves as Arcestes gabbi Meek have been 

 neither described nor figured and may possibly belong to some of the 

 Upper Triassic species of Arcestes which had not been recognized in 



52 George M. Dawson : Report on a geological examination of the northern part of Van- 

 couver Island and adjacent coasts. Geological and Natural History Survey of Canada, 

 vol. ii, new series, 1886, pp. 9B, 26B, 73B, 76B, 83B, 89B. 



53 J. P. Whiteaves : On some fossils from the Triassic rocks of British Columbia. Con- 

 tributions to Canadian paleontology, vol. 1, pt. ii, No. 3, 1889, pp. 134, 141, 146-147, 

 pi. 19, figs. 3, 4. 



54 Fritz Freeh: Die zircumpacifische Trias. Lethsea geognostica, Toil ii. Bd. 1. 1908. 

 pp. 490-491. 



55 J. F. Whiteaves : On some fossils from the Triassic rocks of British Columbia. Con- 

 tributions to Canadian paleontology, vol. 1, pt. ii, No. 3, 18S9, p. 134. 



