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Hudson Highlands

Mountains on either side of the Hudson River in New York, US

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Through Mountain, Isostasy and Glacier

North to south they fall between Newburgh Bay and Haverstraw Bay, the latter forming the northern region of the New York - New Jersey Highlands.

The Hudson River enters this region in the south at Dunderberg Mountain near Stony Point, and from the north in the vicinity of Breakneck Ridge and Storm King Mountain near Cornwall, New York. These highlands have played a significant role in America's environmental, cultural, and military history.

Geology

The bedrock of the Highlands is part of the Reading Prong and more than a billion years old, formed during the Grenville Orogeny. It represents the very core of the Appalachian range, which has been formed by successive mountain-building events (orogenies). The present mountains have been exposed by the process of isostasy through the late Cenozoic Era. The hills were given their rounded form when glaciers cut through the Appalachian Mountains here. The Highlands are among the lowest summits in that range, and the Appalachian Trail reaches its lowest elevation in the Trailside Zoo between Bear Mountain State Park and Bear Mountain Bridge. Conversely, the river becomes narrower and deeper through the Highlands, reaching its deepest point of 216 feet (66 m), near Garrison. Many stretches are challenging to navigate, earning nicknames like "World's End."

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