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According to an article on Discovery (Aug 21, 2011), the oldest fossils ever found were those of bacteria (micro fossils), which proves that life can exist without oxygen since these fossils date back MORE than 3.4 billion years ago. They were found in Australia.

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12y ago
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15y ago

Metazoans evolved in the Late Neoproterozoic.

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14y ago

Photosynthetic bacteria in the form of stromatolites (essentially sedimentary rocks formed of them) found in Australia. They date back to 3.5 billion years.

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8y ago

In 2011 on an Australian beach, Brasier & David Wacey believe they discovered 3.4 billion year old cells.

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13y ago

The oldest known mollusk is Kimberella. It was a slug like animal that lived about 558 to 555 million years ago.

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13y ago

4.6 billion years old

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Q: What is the ages oldest known fossil?
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