Word: hercynian
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...cooling earth and to decrease in rotational velocity because of tidal retardation. "At the close of the Paleozoic Era, the east-west geosyncline of the northern hemisphere was intensely crumpled by the sliding-together of the North Polar and the Equatorial dome. The result was the Appalachian-Hercynian system of mountains...Meantime, the continent was being domed as a whole. In this way sliding-slopes, directed toward the primitive Pacific Ocean, which was then larger than now, were generated...At last, about the middle of the Mesozoic Era, the unique continent finally succumbed to the pull toward the Pacific...
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