12 December 2013

Some folds along the Crypt Lake trail

Posted by Callan Bentley

Hiking up to Crypt Lake in Waterton Lakes National Park, Alberta, Canada, you can see some sweet stromatolites,



We’ve already taken a look at the falls, but today, let’s zoom into the folds exposed in that shadowy cliff near the center…



These limestone layers are Mesoproterozoic in age – they’re part of the Purcell (Belt) Supergroup. The folding likely dates to the late Cretaceous into early Paleogene “Laramide” Orogeny (as they call it in Canada, though the structural style and location is fundamentally NOT Laramide in the U.S. sense of the word. A Montanan geologist would call this Sevier-style thin-skinned deformation instead).