Approximately how far back do the oldest fossils that we KNOW are actual fossils date to?Group of answer choicesA half billion years after the Archaean eonA half billion years before the Hadean eonA half billion years into the Hadean eonA half billion years after the Hadean eon
Question
Approximately how far back do the oldest fossils that we KNOW are actual fossils date to?Group of answer choicesA half billion years after the Archaean eonA half billion years before the Hadean eonA half billion years into the Hadean eonA half billion years after the Hadean eon
Solution
The oldest fossils that we know are actual fossils date back to approximately a half billion years after the Archaean eon. The Archaean eon is a geologic eon, occurring from 4.0 to 2.5 billion years ago, during which the Earth's crust had cooled enough to allow the formation of continents and life started to form. Therefore, the oldest known fossils would date back to about 2.0 billion years ago.
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