We're Now Pretty Certain Life on Earth Is 3.5 Billion Years Old: "The Earth is 4.5 billion years old. But what about the life that exists on it? We've thought since 2006 that biological activity in the form of stromatolites—ancient layered geological structures—first appeared here 3.5 billion years ago, and now we have even more evidence to prove it.
Scientists took to the Strelley Pool Formation in Australia to check out the sulfur some rock formations that got there as a result of biological activity. They've looked at these deposits before, but this time they analyzed them through a different technique—analyzing the distribution of isotopes in each layer rather than on the whole—and their findings corroborated previous conclusion. "
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