Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation

Cold and Ice, Not Heat, Episodically Gripped Tropical Regions 300 Million Years Ago

Caption: Unaweep Canyon in the Rocky Mountains is the site of a deep gorge that reveals ancient landscapes and sediments. The inset image is of a "dropstone" from an eons-old glacier.

Credit: Gerilyn Soreghan

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Related news release: Cold and ice, not heat, episodically gripped tropical regions 300 million years ago