Word: brachys
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...pressures of overlying rock, were the fossilized tracks of burrowing, wormlike animals -an encouraging indication that more fossils might be near by. Says McNair: "I knew how gold prospectors felt when they stumbled across the mother lode." Splitting open the rock, he found the remains of 47 primitive, clamlike brachi-opods that radioisotope dating proved to be at least 720 million years...
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