The creature's discovery offers a glimpse of the period of geologic time when life on Earth began to proliferate and diversify at quickening pace.
The prehistoric species, Yawunik kootenayi, was discovered in the Burgess Shale Formation, located in the Canadian Rockies of British Columbia -- one of the most fertile fossil sites in the world. The newly unearthed fossil dates back 509 millions years ago, some 250 million years before the first d...
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