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No. That honor would go to the Porcupine Mountains in Northwest Michigan. They were formed 2 billion years ago. It was formerly and erroneously thought that the Saint Francois Mountains of Southeast Missouri (formed 1.4 Billion Years ago). The Appalachian Mountains were formed only 460 million years ago..
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14y ago
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16y ago

No the rocky mountains formed the western coastline and later the cascades formed a island chain of the coast and later joined and is were it is today look it up for more info.

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Q: Is the Cascade Mountain Range older than the Rocky Mountains?
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Is the Cascade mountain range part of the Rocky mountains?

No


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