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 
