GENERAL GEOLOGY 51 



with this material. At the conspicuous nunatak they are 

 cut by a rhyolite dike, already described on page 25. 

 The same slaty rocks seem to compose the shore to the 

 westward, including College and Harriman fiords. We 

 landed at the Bryn Mawr Glacier, in College Fiord, and 

 found the slates cut by two small aplite dikes. 



This series of rocks has been called the Orca Series by 

 Mr. F. C. Schrader. 1 



KADIAK ISLAND 



The eastern half of Kadiak Island ~and the adjacent 

 archipelago are made up of the Vancouver slates without 

 intrusives. Only one block of a scoriaceous basalt was 

 found on the shore at Kadiak village, and that may have 

 been brought there as ballast. Figure 1 2 shows the village 

 and a group of smaller islands off the coast. The shore 

 was examined for several miles on either side of the town, 

 and the mountain from the slope of which the picture was 

 taken was ascended. Everywhere the slates were found, 

 and the fossils were especially abundant along the shore 

 concealed by the hill in the foreground, and in the bluff 

 coast of Pogibshi Island opposite the town. The tip of this 

 island, where several unique specimens were obtained, 

 is represented in figure 13. A photograph (plate vi) 

 showing the cleavage was taken by Mr. Gilbert on the 

 slender cape running to the right from the same island. 

 At the cleared place in the middle of the most distant is- 

 land but one (Woody Island) is the station of the North 

 American Commerical Company. Just to the left of this 

 is a locality at which Dr. Dall, in 1895, found bivalve 

 shells in association with the more common fossils of the 

 slates. 



The section of slate in plate vi shows both bedding and 

 cleavage. The bedding dips there 60 to the SE, the 



1 20th Ann. Rep. U. S. Geol. Survey, Pt. vii, p. 404. 1900. 



