SAINT LAWRENCE ISLAND. 



139 



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zontal or very lightly inclined stratified materials of brownish and red- 

 dish brown colors, which are with little doubt volcanic, but more probably 

 scoriaceous or agglomeritic than basaltic. Low plateau-like hills some 

 miles further inland appear to be composed of similar materials. Higher 

 hills, at a greater distance from this part of the shore, were seen onl}^ 

 very imperfectly, between clouds. 



The northeast point of the island, ending in cape Chibukak, consists 

 of a plateau about 200 feet in height, with a notabh- level outline as 

 seen from the sea. This plateau, however, declines to the southward to 

 lower land, by which it is connected with the rest of the island. It breaks 



Figure fS.— Shattered granitic Bocks, Cape Chibukak, Saint Lawrence Island. 



off to seaward in cliffs or steep rocky slopes, with here and there pro- 

 jecting pinnacles of fissured rock rising from them. 



A landing was made on the east side of cape Chibukak, where the 

 plateau was found to consist of gray biotite-granite of uniform color and 

 texture and moderately coarse grain. The surface of the plateau is 

 everywhere covered with irregular, angular, broken blocks of granite, 

 much like those often found on high mountain summits, and doubtless 

 the result of severe climatic conditions acting upon the naturally jointed 

 rocks. No erratics were found upon the plateau nor any traces of glacial 

 striation or smoothing, though if such at any time existed they may 



