Massive ancient rockslide shifted the geography of a continent: Study
Undated handout photo of the Valley of the Rocks, B.C. A Canadian geologist has pieced together a portrait of the largest landslide in North American history, a colossal avalanche of boulders that thundered down a Rocky Mountain slope near the B.C.-Alberta border about 10,000 years ago a ' permanently shifting the Continental Divide and leaving the ...
