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Still Waters

500 Million-Year-Old Rare Fossilised Embryos

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Tiny, spherical fossils found in southern China appear to be the embryos of a previously unknown animal.

The fossils come from the Cambrian, a period dating from 540 million to 485 million years ago and known for an explosion of diversity. Some of the organisms that appeared during the Cambrian, such as the bug-like trilobite, had exoskeletons and other hard parts that fossilized nicely. Others, including sponges and worms, were made of soft tissue that rarely preserves.

http://www.livescien...yo-fossils.html

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