SECT. 2] 



THE MiD-UCKANlC lUDUE 



403 



NAUTICAL 



Fig. 12. Bathymetric sketch of the Arctic Ocean showing physiographic divisions and 

 epicenters. The bathyinetric sketch is modified from a chart prepared by E. R. Hope 

 in 19.58 which was largely based on Soviet data (to 1956). The probable original 

 soundings were inferred by superimposing the tracks of drifting stations and aircraft 

 landing sites on a recent Soviet bathymetric chart. The epicenters are from Linden 

 (1959). (After Heezen and Ewing, 1961.) 



