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Scientists find oldest fossil on record

WASHINGTON — What may be the oldest complete fossil on Earth paints a smelly but colorful picture of our microbial ancestors from nearly 3.5 billion years ago.

The fossil is the remains of what once was a purple-and-green slimy, smelly mat of single cell microbes that worked, lived and even communicated together in what is an awful lot like a prehistoric microscopic society. Nora Noffke of Old Dominion University in Virginia found the remnants of this life in sandstone rock in western Australia.

This is likely an ancestor of ours, researchers said.

This tiny fossilized mat, about one-third of an inch thick, would be about 300 million years older than previous complete ancient fossils and about the same age as less complete and still debatable fossils, said study co-author Robert Hazen, a mineralogist at the Carnegie Institution of Science in Washington. He said life on the mat probably had turned sunlight into energy, but unlike life now, probably producing “horribly smelly” sulfur instead of oxygen.

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