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Oldest Worm Trails Found - 1.2 bya



(with picture)

http://news.bbc.co.uk/hi/english/sci/tech/newsid_1977000/1977935.stm

Fossils in rocks deposited 1.2 billion years ago could be the oldest
evidence of animal life discovered so far.

Australian researchers believe a worm-like creature left a trail in
sandstone found off the western tip of Australia.

If confirmed, it would be the oldest example of an animal comprised of
more than one cell.

Until now, it was thought that multicellular animals, or metazoans, only
appeared about 600 million years ago.
...
If the dating studies are correct, scientists will have to explain why
little changed on Earth for millions of years after the arrival of
primitive animals.

The fossil evidence is revealed in the journal Science.