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You are browsing the archive for 24 November 2017 - Mountain Beltway.

24 November 2017

Friday fold: Idaho Springs Fm. amphibolite

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!

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