102 MARION EXPEDITION" TO DAVIS STRAIT AND BAFFIN BAY 



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

 often sculi^tured 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 continual shifting of stabilitv in the irregu- 



The Pinnacled Class of Bergs 



FiGUUE G2. — The fact that many ieehergs in the 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 tlie sea to draft. The berg in tlie photo- 

 graph has a draft equal to about twice its height above 

 water. (Official photograph, international ice patrol.) 



lai--sha])ed Greenland bergs often results in reefs jutting out a hun- 

 di'ed 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- 





