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 Dall (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 l8th Ann. Rep. U. S. Geol Survej. Pt. m, p.*S5- 1898. 



