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First: geologists look at the general shape of the mountain: Sharper peaked mountains are generally younger than rounded ones because erosion has had less time to wear them down (ie the Rockies are younger than the Appalachians).

Second: geologists look at what type of rock is exposed. Not only does this tell us something about when the formation began, it also gives us something to base our erosion estimation off of. Sandstone erodes faster than granite, so you could have a rounded mountain peak made of sandstone that was the same age as a sharp granite peak.

Third: geologists will consult with paleontologists and archaeologists to try to determine the age of the mountain based off of remains that may be present on the mountain. (If, for instance, we find fossil sea-shells, we know that the mountain formation has to fall within certain ranges).

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Q: How do geologists estimate the age of mountains?
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