3.5 Billion-Year-Old Fossils Challenge Ideas About Earths Start

In the arid, sun-soaked northwest corner of Australia, along the Tropic of Capricorn, the oldest face of Earth is exposed to the sky. Drive through the northern outback for a while, south of Port Hedlund on the coast, and you will come upon hills softened by time. They are part of a region called the Pilbara Craton, which formed about 3.5 billion years ago, when Earth was in its youth. Jeff Miller (Epoxy mount); J. William Schopf, UCLA (Microfossil) The fossils add to a wave of discoveries that point to…

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