This is old news, but I hadn't heard it, perhaps someone else might be interested as well, Bob

World's earliest signs of life discovered in WA

Details07 Oct 2011 Written by Bessie Blore
The oldest sign of life on earth has recently been discovered in Western Australia’s Pilbara region – a scientific breakthrough which actually changes the perception of how we came to be…. or at least pushes the story back by 300 million years.
Strelley Pool, a remote region of the Pilbara around 60 kilometres west of Marble Bar, is the scene of this unique discovery. While the earth has been around for about 4.5 billion years, 3.4-billion-year-old rocks at Strelley Pool are home to the oldest and most well preserved microfossils ever to be found on Earth.
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