control. There is also an alternation of light and 

 dark hands which while quite subtle are obvious 

 on close, examinations of an original photographic 

 print. The banding is not a result of the drain- 

 age pattern since it is crossed by drainage chan- 

 nels in numerous locations. The band pairs do 

 not seem to be regularly spaced nor are they 

 perfectly linear or parallel for the width of the 

 iceberg. We feel that such a structure is likely 

 to be the result of flow and that the light and 

 dark bands represent streamlines. The two 

 parallel ridges are. possibly the result of shear or 

 flow over an irregularity of the glacial bed. 



The iceberg's origin remains unknown. The 

 Ward Hunt ice shelf on northern Ellesmere 

 Island, Petermann Glacier in Hall Basin and 

 Humboldt Glacier in Kane Basin are all capable 

 of producing a thin tabular iceberg. Usually 

 such icebergs fragment and deteriorate before 

 they reach 50°N latitude. The last sighting of 

 a similarly-shaped iceberg on the Grand Banks 

 by the International Ice Patrol was in 1964 

 (Lenczyk, 1965). Twenty large tabular ice- 



bergs, some as long as 600m, were sighted by 

 the Ice Patrol aircraft in late February of 1964 

 between Hamilton Inlet and Cape Chidley. They 

 appeared as far south as 44°N by early May 

 1964. These icebergs were thought to have their 

 origin in ice island WH-5 which was observed 

 to block the Kennedy Channel from the Cana- 

 dian shore to Hans Island in 1963 (Franceschetti, 

 1964). 



A low tabular berg of this size is quite un- 

 usual and fortunately rare. It represents a 

 greater than usual hazard for surface vessels 

 due to its lower probability of detection, par- 

 ticularly in a seaway. The iceberg's uniqueness 

 contributed to the attention given it. by the Inter- 

 national Ice Patrol. 



REFERENCES 



Lenczyk, R. E., Report of the Internationa) Ice Patrol 

 Service in the North Atlantic Ocean (Season of 1964). 

 Coast Guard Blletin No. 50 (1965). 



Franceschetti, A. P., U.S. Coast Guard Oceanographic 

 Report No. 5, 1-36 (1964). 



64 



