THE LATE PALEOZOIC IN ALASKA 181 



The four members of the last series are typically exposed; the first, on 

 the west coast of Baranoff Island, Chicagoff Island, Douglas Island, Gravina 

 Island, and the Cleveland Peninsula; the second, near Taku Harbor and 

 George Inlet; the third, at Saginaw Bay on Kuiu or Kiku Island; the 

 fourth, at Soda Springs Bay. The upper series (Permian) (Upper Penn- 

 sylvanian) is well shown at Hamilton Bay, on the Screen Islands, and at 

 Pybus Bay, where the rocks are steeply tilted, folded, and metamorphosed; 

 the middle series occurs at Sitka, Cape Edward, Douglas Island, and the 

 Glass Peninsula, and the rocks of this series are also tilted, folded, meta- 

 morphosed to a schistose condition, and indurated. Fossils from the upper 

 series of rocks were examined by Girty, who records his opinion in the 

 Bulletin cited, page 53, that though they have been previously determined 

 as of Permian age in the Alaskan Range, he regards them as rather lower in 

 position. Of the two upper series he says: 



"These two series, but especially the upper, are what have previously been 

 determined as Permian in the Alaska Range, but I really find that the resemblance 

 with the Gschelian stage of the Russian section is greater than with the Russian 

 Permian. Provisionally, therefore, I will correlate this horizon with the Gschel- 

 stufe, in which occur a great number of equivalent or identical species. This 

 fauna is entirely unlike anything in the Mississippian Province of the United 

 States, but some of our western faunas resemble it." 



This fauna is the same as is found in the McCloud formation of northern 

 California. 



As this fauna is quite similar to others collected in the same general 

 region, the remarks quoted above might be applied to the whole of the 

 heavy limestone in the Admirality Islands. A faunal list is given on pages 

 52 to 55 of Bulletin 347, United States Geological Survey. 



Wright and Wright, speaking of the Upper Carboniferous as including 

 the Permian, say that argillites were extensively laid down at the end of 

 the Carboniferous, which indicates an elevation of the land at the close of 

 the Permian (?) in some adjacent region (probably to the north and east — 

 Case), and that a period of volcanic activity of long duration ensued. 

 "The beds of lava and ash ejected from the volcanic vents were contem- 

 poraneous with the slate beds, and because of their intimate association 

 with the sediments of volcanoes are regarded as submarine intrusives." 

 The series of limestones, and with the associated argillites, greenstones, 

 schist, etc., the Ketchikan series, extends in a generally northwest direction 

 toward St. Elias. Brooks states that Wright found doubtful Permian 

 fossils in the Porcupine placer gold district in southeastern Alaska, but in 

 Wright's report^ I find only mention of Mississippian fossils. On the slopes 

 of the Alaska Range the same series occurs. 



^ Wright, C. W., The Porcupine Placer District, Alaska, U. S. Geological Survey Bull. 

 236, 1904. 



