The Heart Mountain landslide of northwest Wyoming is the largest known
sub-aerial landslide on Earth. During its emplacement more than 2000 km3 of Paleozoic sedimentary and Eocene volcanic rocks slid >45 km
on a basal detachment surface dipping 2°, leading to 100 yr of debate
regarding the emplacement mechanisms. "Even I have a hard time visualizing a mountain moving 50 kilometers, but you can move it if the friction is low enough," said lead
study author Tom Mitchell.