Oldest known fossils prove life began more than 3.4bn years ago

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Steve Conner
London Independent
Aug 22, 2011

The fossilised remains of the oldest known lifeforms on Earth have been discovered in samples of rock collected near a remote watering hole in the middle of the Australian Outback.

Scientists said that the microscopic fossils belonged to primitive bacteria that lived more than 3.4 billion years ago, when the Earth had emerged from a period when it was probably too hostile for life. The primitive microbes used sulphur instead of oxygen to generate energy from food and, the scientists said, they may be the closest that science will ever get to the mysterious origin of life on Earth.

The fossils were found in rocks that were originally formed in shallow seas near a coastline and suggest that beaches may have been the key habitat where the Earth’s first lifeforms thrived, said David Wacey, of the University of Western Australia.

“The environment in which the microfossils were found is important – it extends the record of life in shoreline or beach-like environments by about 200 million years. This suggests that beaches could have been the setting for the origin of life itself,” he said.

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