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, courtesy NSF)
Global Warming News : Cold And Ice, Not Heat, Episodically Gripped Tropical Regions 300 Million Years Ago

Geoscientists have long presumed that, [...]