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The Palisades Sill as seen from the Palisades Interstate Parkway. The Hudson River is the background. The Palisades Sill is a Triassic, 200 Ma diabase intrusion. It extends through portions of New York and New Jersey. It is most noteworthy for The Palisades, the cliffs that rise steeply above the western bank of the Hudson River.
It is widely believed that the formation originally deposited on a shallow rimmed shelf, followed by the development of barrier reefs into an nonlinear and uncoordinated "belt" around the Hudson Basin. Within the Hudson Bay Lowlands, the formation consists of dolomite and limestone rich in both coral and sponge.
The Hudson Bay lowlands, located north of the Canadian Shield, are mainly made of sedimentary rocks from the Silurian Period, although some parts date from the Ordovician and Devonian periods. [1] This area covers 25% of the province. Most of the bedrock in the Hudson Bay lowlands is composed of limestone and carbonate-dominated sedimentary ...
The Becraft Formation is a coarse limestone with occasional thin interbedded shale layers. Individual limestone beds within the formation range from 5 to 15 centimeters in thickness, while the shale horizons are up to 3 centimeters thick. Chert nodules are found near the top of the formation. [5]
It was created by a partial blockage of the Oak Orchard River by glacial drift and an outcrop of limestone and dolomite known as the Lockport formation which forms the Niagara Escarpment. Palisades of the Hudson: November 1984: Hudson River
Location of the Onondaga limestone outcrop in New York State, USA and Ontario, Canada The Onondaga Limestone is a group of hard limestones and dolomites of Devonian age that forms geographic features in some areas in which it outcrops ; in others, especially its Southern Ontario portion, the formation can be less prominent as a local surface ...
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Its limestone bedrock began forming 400 mya, during the Silurian period, when the Catskill region was a river delta and the shallow sea it drained into. The river carried eroded material from the Taconic Mountains to the northeast, then reaching as high as 15,000 feet (4,600 m) over present-day sea level. [5]
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