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Appalachian Geosyncline
geological region, North America
Appalachian Geosyncline, Great downbuckle in the Earth’s crust in the region of the present Appalachian Mountains. It was in the Appalachians that James Hall first worked out the geosynclinal theory of mountain building (see geosyncline).
This article was most recently revised and updated by John P. Rafferty.
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