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Exposed anorthosite on the summit of Whiteface Mountain. Archive Photo of the Day: Judy Andrus Toporcer, Pierrepont NY.
Exposed anorthosite on the summit of Whiteface Mountain. Archive Photo of the Day: Judy Andrus Toporcer, Pierrepont NY.

Natural Selections: Ancient Adirondacks

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"Old as the hills" is a relative term. The Adirondacks may be relatively young mountains, but their distinctive grey granite, anorthosite, originated 1.1 billion ago, so deep in the earth's crust that only continental collision could have formed it. Dr. Curt Stager and Martha Foley discuss Adirondack geology.

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