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Geologists and biologists know where to look for the earliest life--but the rocks are hard to read
FOR TODAY'S CIVILIZED WORLD, WITH ITS DOT-coms, sitcoms, ATMs, and ATVs, the first 3.5 billion years of life on Earth are a bit of an embarrassment. It was only a few hundred million years ago that trilobites prowled the seas. More primitive life subscribed to two or three basic lifestyles: algal mat, spineless worm, or bacterial blob. Before that, in the Archean Eon more than 2.5 billion years
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