24 November 2017

Friday fold: Idaho Springs Fm. amphibolite

Posted by Callan Bentley

Here’s a guest Friday fold from reader Carl Brink:

Carl tells me that this is:

Precambrian Amphibolite schist float boulder from the Idaho Springs Formation in Rist Canyon west of Fort Collins, Colorado.  Knife is 2.25 inches long.

Thanks for sharing, Carl!