CHICHAGOF COVE 
77 
parison with those found in the higher beds. But they 
establish the fact that some of the tuffs at least are water- 
laid deposits, however little the rocks themselves might 
suggest that conclusion. 
The upper beds consist of soft shales, sandstones and 
grits, with some thin beds of limestone and now and then 
a chert band. They are the principal rocks of the region, 
and make up the whole coast line of the area studied. 
The following sections of these beds were noted, and will 
serve to indicate the character of the rocks in different 
portions of the area. 
GEOLOGICAL SECTIONS 
East Point of Chichagof Cove .—Strike N 65° E (true), dip S 
25 0 E, about 45 0 . Dip uniform through the whole section. Alter¬ 
nating bands of soft black shale and fine-grained sandstone, the shale 
more abundant in the lower part of the section. One bed of coarse 
grit, but no conglomerate. Some of the shale is reddish from abun¬ 
dant limonite, and both shale and sandstone in certain layers include 
small limestone concretions, rarely containing fossils. The fossils are 
chiefly casts in massive beds of sandstone occurring in the upper part 
of the section. On exposed surfaces the sandstone breaks up into 
lenticular masses with uneven, curved parting surfaces. The section 
was not measured, but was estimated at not less than 1,000 feet in 
thickness. 
West Point of Chichagof Cove .—Strike N 8o° E, dip S io° E 
about 20°, flattening a little to the west. The base of the section is of 
soft shale, some layers containing limestone concretions, others sparse 
pyrite nodules. Above these are heavy-bedded sandstones, gray to 
greenish gray in color, with numerous, rather scattered fossils. In 
some places the sandstone is full of concretions, from three inches to 
one foot in diameter, which were not found to contain fossils. 
Chichagof Peak .—Resting on the lower pyroclastic beds at the 
base of the mountain is a considerable thickness of soft black shale 
containing a few fossils ; near the contact of the dikes which cut it, it 
is baked and silicified. Above the shale is cross-bedded sandstone, 
highly silicified, in which no fossils were discovered. Above this are 
beds of rusty red shale, with occasional layers of sandstone, to the sum- 
