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GeologyImage:Palisades cliff.jpg Looking south down the Hudson from the Palisades The cliffs are the margin of a diabase sill, formed approximately 200 million years ago at the close of the Triassic Period by the intrusion of molten magma upward into sandstone. The molten material cooled and solidified before reaching the surface. Subsequent water erosion of the softer sandstone left behind the columnar structure of harder rock that exists today. The cliffs are approximately 300 ft (100 m) thick in sections and were probably originally 1,000 ft (300 m) high, approximately two to three times as high as they are today. History
In the 19th century, the cliffs were subject to widespread quarrying for railroad ballast, leading to local efforts to preserve the cliffs. A section of the cliffs north of Fort Lee were subsequently purchased by John D. Rockefeller, who donated them to the State for permanent preservation. The land is now a part of Palisades Interstate Park, a popular destination for hiking and other outdoor recreational activities, that also includes Harriman-Bear Mountain State Park, Minnewaska State Park Preserve and several other parks and historic sites in the region. In June of 1983, the Palisades were designated a National Natural Landmark by the National Parks Service. The term cliffhanger was created on the Palisades, when the popular silent movie serial The Perils of Pauline used locations around Fort Lee, then a major movie capital. Crossings of the Palisades
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