Fossils
The Burgess Shale: Evolution's Big Bang
A storied trove of fossils from a Canadian paleontological site is yielding new clues to an explosion of life on earth
Burgess Shale's Weird Wonders
The fossils found in the Burgess Shale include the 500-million-year-old ancestors of most modern animals
The World's Largest Fossil Wilderness
An Illinois coal mine holds a snapshot of life on earth 300 million years ago, when a massive earthquake "froze" a swamp in time
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