592 T. C. CHAM BERLIN 



Between the Tuktoo glacier and the Bowdoin glacier, which 

 lies immediately east of it and runs transverse to this part of it, 

 there is a valley in which has accumulated morainic material 

 from both. The amount of this, however, is rather unexpectedly 

 small when we consider the size of the two glaciers and the 

 activity of the latter. Under this debris there is much ice and 

 probably the two glaciers are in actual contact below it. Between 

 the two glaciers and the adjacent nunataks there are two small 

 lakelets of triangular outline, one lying on the right-hand side of 

 the Tuktoo glacier, hemmed in between the two glaciers and the 

 Sentinel nunatak, and the other on the left hand, between the 

 two glaciers and the Sierra nunatak. 



The vicinity of the nunataks afforded an opportunity to find 

 a minimum measure of the height to which the ice formerly rose. 

 Drift and glacial erosion were observed on the summit of the 

 Sentinel nunatak up to a height of about 1600 feet. The 

 extreme summit was much broken and riven and gave uncertain 

 evidence whether it had been completely submerged or not. 



T. C. Chamberlin. 



