Terre boule de neige
Paul Felix Hoffman, FRSC, OC (born March 21, 1941) is a Canadian geologist and Sturgis Hooper Professor Emeritus of Geology at Harvard University. He specializes in the Precambrian era and is widely known for his research on Snowball Earth glaciation in the Neoproterozoic era particularly through his research on sedimentary rocks of Namibia.