Oldest fossils

And these are really small:

Odd-shaped mounds of dirt in Australia turn out to be fossils of the oldest life on Earth, created by billions of microbes more than three billion years ago, scientists say in a new report.

And these mounds are exactly the type of life astrobiologists are looking for on Mars and elsewhere.

A study published Thursday in the journal Nature gives the strongest evidence yet that the mounds dotting a large swath of western Australia are Earth's oldest fossils.

Posted by David on June 8, 2006 8:42 AM