GENERAL GEOLOGY 45 



Yakutat Bay, Prince William Sound, Kadiak, and Port 

 Clarence in the far north near Bering Strait. The ob- 

 servations given above (page 41) show its possible presence 

 on St. Lawrence Island. It is even more probable, from 

 the observations of Dr. Dawson, 1 that the same series is 

 present on Atka Island and Attu Island, the westernmost 

 of the Aleutians, where the rocks comprise (i) much al- 

 tered and indurated volcanic materials with purplish, green- 

 ish and grey colors, partly eruptive, partly clastic, (2) fine- 

 grained feldspathic elastics which pass into a black com- 

 pact material, apparently a true argillite. They are 

 strongly folded and eroded. 



The series was described first by E. Hoffman in 1829 

 from Sitka, in his Geognostische Beobachtungen, as a fine- 

 grained siliceous greywacke with interbedded clay slate. 2 



Dr. Dawson, in his report cited below, says that the 

 name Vancouver Series was first applied by Dr. Selwyn 

 in 1871 to the similar argillites, quartzites and limestones, 

 with interbedded volcanic materials, of the southern part 

 of Vancouver Island. 3 



In 1886 Dr. Dawson applied the name Vancouver Se- 

 ries to the entirely similar beds in the northern parts of 

 Vancouver Island and in the Queen Charlotte Islands to 

 the north, 4 in which fossils characteristic of the Alpine 

 Trias have been found; namely, Monotis subcircularis 

 Gabb, Halobia (Daonella) lomelli Wissman, Aulaco- 

 ceras charlottense Whiteaves, Arcestes gabbi Meek, 



1 Geological notes on some of the Coasts and Islands of Bering Sea and vicin- 

 ity. Bull. Geol. Soc. Am., vol. v, p. 122. 1894. 



8 Becker, Gold Fields of Alaska, i8th Ann. Rep. U. S. Geol. Survey, Pt. ni, 

 p. 43. 1898. 



'This would seem to be a lapse of memory, as in the report of Dr. Selwyn 

 the term Cascade Mountains and Vancouver Island Series is applied to a wholly 

 crystalline complex of gneisses, diorite-porphyries and limestones, placed below 

 rocks containing Paleozoic fossils. Geol. Survey Canada, Rep. Prog. '7i-'72, p. 

 64. 1872. 



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

 Rep., N. S., vol. ii, pp. 96- loB. 1886. 



