Paleo Slide Set: Heinrich Events: Marine Record of Abrupt Climate Changes in the Late Pleistocene
Micrograph detailing the sand-size fraction from the same core at 670-672 cm depth, within H-2.

Core sample sediments deposited during Heinrich events are comprised almost entirely of lithic fragments. 

Photo Credits:
Anne Jennings 
Institute of Arctic and Alpine Research, University of Colorado-Boulder Boulder, Colorado