46 ALASKA GEOLOGY 



Celtites vancouverensis Whiteaves. 1 In 1 889 he extended 

 the name to the argillites of Wrangell, together with 

 those met with near Juneau, at Sitka, and along the east 

 side of Lynn Canal, including also the altered volcanic 

 rocks found in association with them, though no fossils 

 were obtained at these northern localities. 2 



The same rocks were called the Yakutat System by 

 Professor I. C. Russell, 3 who gave them a much higher 

 place in the series than we have. They were observed by 

 him under great difficulties during the ascent of Mount 

 St. Elias. 



Similar rocks in Prince William Sound have been 

 called the Orca Series by Mr. F. C. Schrader. 4 He paral- 

 lelizes them provisionally with the Kenai Series of Spurr 

 in the Yukon District (1896), the Yentna Series of Spurr 

 in southwestern Alaska, and the Kenai Series of Eldridge 

 in the Sushitna River (1898), and assigns them to the 

 Eocene or Oligocene. 5 



Mr. E. O. Ulrich, who has studied the fossils gathered 

 from Kadiak and Yakutat Bay, finds that their age is, 

 with little doubt, lower Jurassic. (See his paper in this 

 volume.) 



Most of the Jurassic fossils described from the north- 

 west are in limestone and are assigned to much higher 

 levels in this system. A few distinctly Alpine Triassic 

 forms have been described from shales assigned to the 

 Vancouver Series by Dr. Dawson, as noted above. It is 

 also noted that the shale at Cold Bay, containing Monotis, 



J Rep. on northern part of Vancouver Island, Geol. Survey of Canada, Ann. 

 Rep., N. S., vol. n, p. io8B. 1886. 



*Rep. on Yukon District, Geol. Surv. of Canada, Ann. Rep., N. S., vol. in, 

 p. 326. 1889. 



'Expedition to Mt. St. Elias, National Geographic Magazine, vol. in, p. 167. 

 1891. 



* A Reconnaissance of a part of Prince William Sound and the Copper River 

 District. 2oth Ann. Rep. U. S. Geol. Survey, Pt. vn, p. 404. 1900. 



6 zoth Ann, Rep. U, S. Geol. Survey, Pt. vn, p. 413. 1900. 



