This photograph shows a nearly horizontal layer of basalt thatnow crops out as a cliff along the Hudson River, across fromNew York City. It is parallel to layers of sandstone above andbelow, and is younger than all of those layers. The basaltintruded at 190 Ma, as Pangaea was breaking apart. What is thisbody of basalt, and in what geologic setting did it form?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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This photograph shows a nearly horizontal layer of basalt that
now crops out as a cliff along the Hudson River, across from
New York City. It is parallel to layers of sandstone above and
below, and is younger than all of those layers. The basalt
intruded at 190 Ma, as Pangaea was breaking apart. What is this
body of basalt, and in what geologic setting did it form?

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