Ancient Earth
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Atlantica was an ancient continent
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Ur was the first continent, formed three billion years ago, followed by Arctica half a billion years later. Another half a billion years passed before Baltica and Atlantica emerged
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Earth is about 4.5 billion years old. The oldest rocks are about 3.9 billion years old. Microfossils have been found in 3.5 billion year old rocks. At that time the earth's atmosphere was mostly CO2.
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