Scientists have discovered that ancient animals preserved in the famous Burgess Shale fossil deposit were killed by a mud slurry that buried them so deep their whole bodies were petrified.

The finding solves a mystery that puzzled paleontologists since the revealing fossil trove was discovered in 1909 — how were the animals' bodies so well preserved? "

http://www.livescience.com//history/080226-fast-death.html


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