The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth’s earliest convincing evidence of life (stromatolites, fractionated sulfur/carbon isotopes ...

The water at Rainbow Springs is Caribbean blue with stretches of dark green river grass interrupted by patches of white sand. Just north of the city of Dunnellon, this spring’s run is deep and ...

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