There were also discoveries of major scientific importance. These included the snow-free Dry Valleys in the western mountains, the emperor penguin colony at Cape Crozier, scientific evidence that the Ice Barrier was a floating ice shelf, and a leaf fossil discovered by Ferrar which helped to establish Antarctica's relation to the Gondwana super-continent. Thousands of geological and biological specimens had been collected and new marine species identified. The location of the South Magnetic Pole had been calculated with reasonable accuracy. On the medical side, Wilson discovered the anti-scorbutic effects of fresh seal meat, which resolved the lethal threat of scurvy to this and subsequent expeditions.