noted that the shape of the crater is rectangular rather than circular, and 
is apparently controlled by an intersecting northwest and northeast fracture 
pattern, regional in extent. The ’crag and tail* appearance of the landscape 
and the prominent grooving of the andesites within the circular lake are the 
result of ice movement from north to south. These features are enhanced by 
the low sun angle (15 degrees) and a light dusting of snow. 
Figure 6. Prince Albert Sound, Victoria Island, Arctic. 1768-18493-4,5,7. 
30th August, 1974 
Victoria Island is an area of subdued relief well known for the abun 
dance arid variety of its morainic features. Only in the upper left hand 
quadrant of the image is the moraine thin or absent. Dark greens, blues and 
brown colours indicate the presence of gabbro sills interbedded with sedi 
ments of Proterozoic age dipping gently to the south. The remainder of the 
image area is underlain by flat lying sandstones, siltstones and dolomites 
of Lower Palaeozoic age. The moraine cover, which is typically a loam or 
sandy loam material, may, locally, exceed 100 m in thickness. Most of the 
hollows in the landscope, even quite small ones, are filled with water. 
Because of this it is possible to recognize very many of the patterns and 
structures present. Hummocky, ribbed and fluted moraines and the 'washboard' 
textures are all recognizable, together with the distinct 'kettle' topography 
formed by the melting of blocks of ground ice caught up in the moraine. 
Figure 7. Kluane Lake, Yukon. 1419-20042-4,5,7. 15th September, 1973. 
The image represents an area in the southwest part of the Yukon. Alaska 
lies less than 60 km to the west with the Pacific Ocean and British Columbia 
at similar distances to the southwest and south respectively. The greater 
part of Kluane Lake (seen just to the right of the centre of the image) lies 
within the Shakwak trench which crosses the image centre. This is a very long 
fault zone (500 km in Canada) which becomes the Denali fault in Alaska. The 
Shakwak trench divides the area into two structural regions. To the northeast 
there is the Yukon Crystalline Platform, formed by Early Palaeozoic gneisses 
with granite plutons of Mesozoic and Tertiary age. Southwest of the trench 
are the St. Elias mountains, the highest mountain range in Canada with 
individual peaks more than 6000 m above sea level. The crystalline rocks of 
Upper Palaeozoic age which form these mountains are largely obscured here by 
the very extensive cover of snow and ice. Very many of the features which 
typify an alpine glacial landscape, the cirques, aretes, U-valleys, glaciers 
with medial and lateral moraines, outwash plains, all these may be recognized 
here. 
Figure 8. Medicine Hat, Alberta. 1431-17494-4,5,7. 27th September, 1973. 
The appearance of this image is unusual in that it might easily be mis 
taken for a 'normal' colour photograph. This was achieved by representing 
infrared energy (band 7) as green, red energy (5) as red, and green energy (4)