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Wrinkles in rock may be signs of early life

from Laboratory Equipment

Take a walk along any sandy shoreline, and you're bound to see a rippled pattern along the sea-floor, formed by the ebb and flow of the ocean's waves. Geologists have long observed similar impressions — in miniature — embedded within ancient rock. These tiny, millimeter-wide wrinkles have puzzled scientists for decades: they don't appear in any modern environment, but seem to be abundant much earlier in Earth's history, particularly following mass extinctions. more

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