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About Staten Island, NY

During the Paleozoic Era, the tectonic plate containing the continent of Laurentia and the plate containing the continent of Gondwanaland were converging, the Iapetus Ocean that separated the two continents gradually closed, and the resulting collision between the plates formed the Appalachian Mountains. During the early stages of this mountain building known as the Taconic orogeny, a piece of ocean crust from the Iapetus Ocean broke off and became incorporated into the collision zone and now forms the oldest bedrock strata of Staten Island, the serpentinite. This strata of the Lower Paleozoic (approximately 430 million years old) consists predominantly of the serpentine minerals, antigorite, chrysotile, and lizardite; it also contains asbestos and talc. At the end of the Paleozoic era (248 million years ago) all major continental masses were joined into the supercontinent of Pangaea. The Palisades Sill has been designated a National Natural Landmark, being "the best example of a thick diabase sill in the United States." It underlies a portion of northwest Staten Island, with a visible outcropping in Travis, off Travis Road in the William T.