Smithsonian Report. 1963. — SSetler 



1. Aerial view of low-center soil poh'gons on the Alaskan Arctic Coastal Plain west of 

 Point Barrow. Their basins are water-filled (dark), but some of the ponds are nearly 

 or quite choked off by vegetation (light). In foreground are parallel tracks of a winter 

 "cat" trail, made bv tracked vehicles like the "Weasel." Taken from altitude of about 

 100-200 feet. 



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' . *~^ ii -V 3IK. 



2. Frost boils on . 



:. ,1 L ._!,j_Mj!'_ ,il' -'i^; ; i ' "• i l-;^;i'\\:i;,- .1- ,ii>-i.i \.( lUO feet on Eagle 



Summit, east-central Alaska. Vegetation patches are mainly mountain avens (Dryas) 

 and a dwarf willow (Salix phlehopliylla) . Taken in late June 1957. 



