Rock Types and Their Process in NYC's Geology

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Last updated 12:13 AM on 4/13/26
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6 Terms

1
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Palisades & Igneous Features: What are the Palisades?

A long, steep ridge along the west side of the Hudson River made of igneous rock

2
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Palisades & Igneous Features: What rock makes up the Palisades?

Diabase, a resistant igneous rock

3
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Palisades & Igneous Features: When did the Palisades form?

During the Jurassic period about 200 million years ago

4
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Palisades & Igneous Features: How did the Palisades form?

From volcanic activity and cooling magma forming a sill

5
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Palisades & Igneous Features: What is a sill?

An intrusive igneous rock that forms when magma cools between layers underground

6
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Palisades & Igneous Features: Why do the Palisades stand out as a ridge?

They are made of hard, erosion-resistant rock (diabase)