Rebounding beach

Evidence of the once-equatorial large igneous province that may have kickstarted the Cryogenian is preserved in Nunavut, Canada. Sills—intrusions of volcanic material into older rock layers—cut across older, sand-colored rock. The bands in the lighter rock result from the coastline rising after the glaciers that had weighed down the coast retreated. Image from Mike Beauregard, Wikimedia Commons.