How Old Are The Rocks In The Appalachian Mountains?
The rocks at the core of the Appalachian Mountains formed more than a billion years ago. How old are the Rocky and Appalachian Mountains? Surprisingly, the Rockies are much younger than the eroded Appalachian Mountains to the east. The Rockies were formed between 80 and 55 million years ago, whereas the Appalachians are nearly 500 …
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