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Contact: Katherine Unger Baillie
University of Pennsylvania

Boulder Sampling

Caption: Jane Willenbring (upper right) takes samples to date a boulder in Spain's Bejar mountain range. Her findings helped show that ancient glaciers in the region reached their maximum size several thousands of years earlier than once believed.

Credit: University of Pennsylvania

Usage Restrictions: Please credit the University of Pennsylvania for this image.

Related news release: Penn study finds earlier peak for Spain's glaciers

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