image: Boulders and associated glacial deposit (moraine) of the study. Researchers collect rock samples from these boulders, extract quartz from them and determine the amount of rare isotopes in them. Their surface age relates the amount of time the boulders are exposed to bombardment of high energy particles that originate from space. This material relates to a paper that appeared in the Nov. 10, 2017, issue of Science, published by AAAS. The paper, by B. Menounos at University of Northern British Columbia in Prince George, BC, Canada, and colleagues was titled, "Cordilleran Ice Sheet mass loss preceded climate reversals near the Pleistocene Termination." view more
Credit: Brian Menounos, UNBC