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The trails along the Palisades Interstate Park cliffs on the New Jersey side of the George Washington Bridge are primarily composed of diabase. This igneous, volcanic rock is about 200 million years old, appearing dark with a "salt-and-pepper" texture due to light feldspar and dark augite minerals.
Key details about the rocks in this area:
Composition: Palisades diabase is a hard, basalt-like rock.
Structure: The cliffs are sheer, rising over 300 to 500 feet, featuring dramatic, vertical rock columns.
Trail Features: Trails like the Shore Trail and those around Fort Lee feature steep rocky slopes, large boulder fields (especially near the "Giant Stairs" further north), and rocky shorelines.
Appearance: The rock is generally dark, often covered in moss or lichen, forming steep, jagged talus slopes.
These rocks formed during volcanic activity as molten rock cooled slowly beneath the surface, later exposed by erosion to form the cliffs seen today.
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