GENERAL GEOLOGY 27 



scribed by Lawson, 1 who assigns them (doubtfully, owing 

 to lack of fossils) to the Jurassic or to the very lowest 

 Cretaceous. 



Correlation over such wide distances, based only on 

 lithologic similarity, has of course little value, but taken 

 in conjunction with the other evidence for the existence 

 of Mesozoic rocks in the Cook Inlet region, the facts may 

 here be given a certain amount of significance. 



From the steamer it appeared that the same chert series 

 was present at Seldovia, lower down on the same side of 

 the bay; but the rocks were not visited, and the only 

 specimens brought aboard at that point were of shale and 

 grey limestone impregnated with pyrite and pyrrhotite. 



At Kadiak, on Kadiak Island, I received from Mr. W. 

 J. Fisher, an old resident, several ammonites and speci- 

 mens of Inoceramus porrectus Eichwald " from the moun- 

 tains below Homer on Cook Inlet," and Belemites -pax- 

 illosus? from Kamishak Bay on the western side of Cook 

 Inlet. "The mountains below Homer" would indicate 

 some point in the mountains back of Seldovia, which 

 would be a new locality for these fossils, although other 

 Neocomian fossils have been found near Port Graham. 2 



KADIAK ISLAND 



The rocks around the village of Kadiak and on the adja- 

 cent islands are of the Vancouver Series. At Sturgeon 

 Bay, at the west end of Kadiak Island, we found massive 

 cliffs of igneous rocks. A dark uralitic diorite of grani- 

 toid structure (133), probably an altered gabbro, is cut by 

 a lighter-colored grey granite (135), full of blue quartz, 



'Geology of the San Francisco Peninsula. 15th Ann. Rep. U. S. Geol. 

 Survey, p. 420. 1895. 



2 Dall, Coal and Lignite of Alaska, i7th Ann. Kept. U. S. Geol. Survey, 

 Pt. i, p. 866. 1896. 



It is possible that these fossils came from the locality at Anchor Cape, Cook 

 Inlet, mentioned by Dr. Dall on the same page. 



