GENERAL GEOLOGY 49 



YAKUTAT BAY 



At the camp made beside the Malaspina Glacier, on the 

 west side of Yakutat Bay, Mr. Palache was able to see 

 the sandstone and grits at one place only, near the base of 

 the mountains. They here offered no peculiar features. 



On Osier Island, at the mouth of Russell Fiord, and on 

 the mainland south of the island Mr. Gilbert found soft 

 black shale and a light grey, fine-grained, feldspathic and 

 slightly micaceous sandstone. Farther up the fiord, on 

 the shore of Nunatak Inlet, near the Nunatak Glacier, he 

 found a considerable tract covered by a rather crystalline 

 fissile blue slate, much more metamorphosed than most 

 of the rocks of this series in this region. 



Still higher up in Russell Fiord, landing was made 

 near a small glacier opposite the mouth of the valley 

 occupied by the Hidden Glacier. Here the Yakutat 

 Series consists of black shales including layers of fine 

 dark sandstone, with veins and large pockets of quartz 

 containing copper stains. These rocks have been invaded 

 by a granitoid intrusive rock, fine-grained and gneissic at 

 the contact, coarser and granular at a little distance, which 

 is similar in character to the biotite-tonalite found so 

 abundantly farther to the south. It has altered the sand- 

 stone at the contact to a micaceous quartz-schist. The 

 presence of this intrusive here confirms the correlation 

 of the Yakutat Series with the Vancouver Series as found 

 at Glacier Bay, on Baranof Island and at Beaver Cove on 

 Vancouver Island, far to the southward. 



Five miles south of Hidden Glacier in Russell Fiord a 

 section made in the Yakutat Series shows black shale, 

 much shattered, and kneaded with coarse sandstone; buff 

 sandstone full of narrow calcite veins; grey limestone 

 with white bands containing on the borders greenish ser- 

 pentine inclusions; and heavy beds of coarse conglomerate 



