14 



A CONTRIBUTION TO THE STUDY OF ICE-STRUCTURES 



greater part of the year in the still liquid deeper zones. At the same time the evidence 

 was clear that in some cases the organisms which came to life on being thawed out had 

 been frozen in such positions for a long time. 



6. COAST LAKE 



Refer to Vol. I, p. 162. A nearly circular lake averaging about a hundred yards 

 across. Greatest depth met with, four feet one inch. The distribution of algal peat 



Ft. IT!S. 



BEJEL 



if 



Sp. Gt. 

 (water) 



l.oooo Clear, bubbly, prismatic Ice 

 in horizontal layers. 



I. 0012 Saline Ice 



1 00X2 Granular ice containing 75^ 

 by buiK. of algal Peat. 



I 0004 La ye r 3 with and without 

 Peat in alternation. 



ooo? 



Rock-rubble on Hock. 



Fig. 4. Coast Lake Section 



in some of the ice-layers, the character of the crystallisation, and the degree of 

 salinity at various depths, all indicated that a long period had elapsed since the lake 

 had been completely thawed. The usual summer condition does not exceed a partial 

 thaw downwards from the surface. 



Specific gravity determinations on the waters obtained by melting samples of the 

 ice gave as follows : 



Average bubbly ice between four inches and ten inches 

 Prismatic ice between one foot six inches and one foot eleven 



inches .......... 



From peaty layer between two feet and two feet nine inches 

 Between two feet eight inches and three feet eight inches . 

 From the four-inch peaty layer between three feet eight inches 



and four feet ........ 



Sp. gr. 



1-0000 



1-0012 

 1-0022 

 1 -0004 



1-0007 



