This is picture of a glacier near Penny Ice Cap on Canada's Baffin Island seen during the Apr. 23, 2014, IceBridge survey flight. Disclaimer: AAAS and EurekAlert! are not responsible for the ...

They were studying diamond samples from Baffin Island, a glacier-covered land mass near Greenland, when they noticed a remnant of North Atlantic Craton. Cratons are ancient, stable parts of the ...