Hells Canyon, America's Deepest Gorge, Is Only 2.1 Million Years Old
Originally Published 7 months ago — by Phys.org
Recent research indicates that Hells Canyon, North America's deepest gorge, is only about 2.1 million years old, having been carved by a major drainage capture event involving the Snake River around that time, with evidence derived from cave sediment dating and river profile analysis.