Taxonomy term

canyon

Small floods can carve big canyons

Through the early 20th century, geologists argued over how the giant canyons of the Channeled Scablands in Eastern Washington were formed. Ultimately, a theory proposed by J Harlen Bretz in the 1920s — that the canyons were carved by catastrophic, short-lived outbursts of floodwaters unleashed when natural dams holding back glacial lakes collapsed — was shown to be correct. Controversy still exists, though, about the size of these ancient floods.
 

03 Feb 2017

Travels in Geology: Rafting the Pacific Northwest's heavenly Hells Canyon

Few roads and only steep, difficult trails run down into Hells Canyon — the deepest canyon in North America — which forms part of the border between Oregon and Idaho. But the location is popular among boaters, whitewater rafters and fishermen, and a trip down the river reveals some spectacular rocks.

18 Sep 2015