Paleo Slide Set: Heinrich Events: Marine Record of Abrupt Climate Changes in the Late Pleistocene
East Greenland

We seldom think of icebergs as dirty, and with good reason: only some icebergs contain debris, 
and even then, only in a 1-2m layer like that which is plainly visible in this iceberg. 

Photo Credits:
Julian Dowdeswell 
Centre for Glaciology, Institute of Earth Studies, University of Wales