The Burgess Shale: Evolution's Big Bang

The fossil-hunting expedition began with a lung-busting hike, accompanied by an incessant ring-ding-ting-clank-clank-ring-ting-ding-clank. The soundtrack came courtesy of an anti-bear bell attached to the backpack of the group's leader, Jean-Bernard Caron, a curator of invertebrate paleontology at Toronto's Royal Ontario Museum. After four hours of hiking up switchbacks through an evergreen forest deep in the Canadian Rockies, Caron suddenly took off like a mountain goat. As the others caught their breath, he zipped his way across loose and jagged rock up the final ascent. Eventually the team reunited at the top of the cliff and collapsed, surveying the view over the Burgess Shale.

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