Oldest Fossils of Large Seaweeds, Possible Animals Tell Story About Oxygen in an Ancient Ocean (http://www.sciencedaily.com/releases/2011/02/110216132032.htm)
QuoteScienceDaily (Feb. 16, 2011) â€" Almost 600 million years ago, before the rampant evolution of diverse life forms known as the Cambrian explosion, a community of seaweeds and worm-like animals lived in a quiet deep-water niche under the sea near what is now Lantian, a small village in Anhui Province of South China. Then they simply died, leaving some 3,000 nearly pristine fossils preserved between beds of black shale deposited in oxygen-free waters...
Fossils of this age are incredibly rare as most organisms had a consistency of jellyfish or wet leather and thus only fossilised under very particular conditions. Fascinating stuff!
Marvelous fossils. And worm like creatures? New discoveries all the time.