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Surprise superhighway: Cambrian worms lived in “unsustainable” ocean 500 mya

Problem the find creates: "It has always been assumed that the creatures in the Burgess Shale -- known for the richness of its fossils -- had been preserved so immaculately because the lack of oxygen at the bottom of the sea stopped decay, and because no animals lived in the mud to eat the carcasses." Read More ›