IN THE SUMMER of 1971, a young geologist named Mike Voorhies was scouting around onsome grassy farmland iern Nebraska, not far from the little town of Orchard, where hehad grown up. Passing through a steep-sided gully, he spotted a curious glint in the brushabove and clambered up to have a look. What he had seen was the perfectly preserved skull ofa young rhinoceros, which had been washed out by ret heavy rains.
A few yards beyond, it turned out, was one of the most extraordinary fossil beds everdiscovered in North America, a dried-up water hole that had served as a mass grave for scoresof animals—rhinoceroses, zebra-like horses, saber-toothed deer, camels, turtles. All had diedfrom some mysterious cataclysm just uwelve million years ago iime known togeology as the Mioe. In those days Nebraska stood on a vast, hot plain very like theSerei of Africa today. The animals had been found buried under volic ash up to te deep. The puzzle of it was that there w……（内容加载失败！）
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