16 September 2016

Friday fold: Centenary migmatite

Posted by Callan

burton-mig

Those are some lovely ptygmatic folds in a migmatitic gneiss from Rocky Mountain National Park in Colorado. The age of the rock is apparently Mesoproterozoic. Bill Burton, who has shared Friday folds before, took the photo in the park on the 100th anniversary of the founding of the National Park Service.