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Earliest records of Earth's atmosphere found in ancient rocks, shows persistence down billions of years

from International Business Times

A memory of Earth's primordial surface environment recorded in ancient rocks four billion years old shows it was similar to that a billion years later, and compatible with terrestrial microbial life. Researchers from McGill studied rocks along the Hudson Bay coast in the Nuvvuagittuq Greenstone Belt in northern Quebec, believed to be deposited as sediments 4.3 billion years ago. more

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