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GREEN MOUNTAINS, a considerable mountain range commencing in Hartford co., Conn., and extending N. through Massachusetts and Vermont into Lower Canada. Length, about 240 miles. Their greatest elevation is in Vermont, where Mount Mansfield, or North Peak, rises to a height of 4,389 feet. Their geological formation is the metamorphic slates, gneiss, quartz rock, limestone, etc., of the Laurentian epoch, the general range of which is about N. 15° E., with a prevailing dip of 30° to 55°. The slopes are covered on the disappearance of the snow in spring with fine pastures of rich green grass, which may have given to the mountains their name, though this is commonly referred to the growth of evergreen forest trees.