CHICHAGOF COVE 
71 
which appeared to be surface flows, are coarse tuffs, very 
soft and rotten, containing kaolinized feldspar and biotite 
crystals as the only determinable constituents. 
One of the members of a party which remained at Sand 
Point for some time collected large quantities of chalced¬ 
ony from the beach a short distance from the harbor. 
He reported it very abundant in the low cliffs along the 
shore but brought no specimens of the rock in which the 
veins occur. This is probably the occurrence referred 
to by Dali (loc. cit). The chalcedony is for the most part 
colorless or pale yellow, but a few pieces are a richly 
colored carnelian, and others are opaque from included 
greenish silicates (chlorite?). One specimen of yellow- 
brown jasp-opal was among those collected. 
A visit was made to the Apollo gold mine on Unga 
Island, but we were unable to go underground in the few 
moments at our command, and the only rocks examined 
were those exposed at the landing place in Delarof Harbor. 
These are highly altered dacites and no facts were ob¬ 
served which add to the description of them given by Mr. 
Becker. 1 
One other rock specimen was brought aboard, said to 
come from the shore of Unga Island on the west side of 
the point opposite Sand Harbor. This is a banded rhyo¬ 
lite , grey in color and weathering buff with white bands. 
It is a very compact rock, and in section (128) shows little 
but an imperfectly granophyric intergrowth of quartz and 
feldspar with occasional magnetite grains. It is extremely 
similar in appearance to the rhyolite described (page 25) 
from near the Columbia Glacier in Prince William Sound. 
STEPOVAK BAY, ALASKA PENINSULA 
Stepovak Bay is a broad bay on the coast of the Alaska 
Peninsula a little east of north from the larger of the Shu- 
1 18th Ann. Rep. U. S. Geol Survey. Pt. m, p/55. 1898. 
