102 



MARION EXPEDITION TO DAVIS STRAIT AND BAFFIN BAY 



diagonally across them. The surface of the berg above water is 

 often sculptured and chiseled in marked contrast to the part below 

 surface which has been smoothed and rounded in contour by the 

 effect of the sea. The continiud shifting of stabilitv in the irresu- 



The Pinnacled Class of bergs 



FiGUUE 62. — The fact that many icebergs in tlie north are 

 pinnacled and irregular causes the question of mass flota- 

 tion to become a subject of mostly academic interest, and 

 as a result the attention becomes focused on the proportions 

 of height above the sea to draft. The berii- in the photo- 

 graph has a draft equal to about twice its height above 

 water. (Official photograph, international ice patrol.) 



lar-shaped Greenland bergs often results in reefs jutting out a hun- 

 dred feet or more underwatei" beyond the visible contour of the ice. 

 These submerged ledges usually stand out beneath the waves as 

 clearly as a coral reef in southern climes, yet they may prove ex- 



