![]() ![]() ![]() The unique process of fossilization that occurred in the Burgess Shale allowed exquisite preservation of these early animals. Most of our knowledge about these early life forms comes from the Burgess Shale, a 540-million-year-old formation of black shale discovered in 1909 by Charles Walcott in the Rocky Mountains of British Columbia. Many of these animals became extinct, leaving no descendants, whereas others may have evolved into groups that are familiar to us today. A Closer Look Animals in the period known as the Cambrian Explosion sported bizarre combinations of legs, spines, segments, and heads found in no present-day animals. ![]()
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