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16 April 2021
Friday fold: Colorado cluster
Friday means folds –
This week, we head to the Colorado Rockies for a butterfly-like presentation of a ptygmaticly folded granite dike within biotite schist.
8 November 2019
Friday fold: Rist Canyon cobble
From a creek bed in northern Colorado, the Friday fold distorts foliation in early Proterozoic quartzofeldspathic gneiss, peppered with small almandine garnets.
24 August 2018
Friday fold: Gneiss from Arapaho Pass, Colorado
It’s Friday, and I have another guest Friday fold to share: This one is from my Denver friend Greg Willis, who tells me it’s from near Arapaho Pass, near where we rain-hiked. Ahhhh, yes – a singularly soggy hike up in the Colorado Rockies. I remember it well, and it looks like Greg had better weather on this jaunt! Happy Friday to all!
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!
16 September 2016
Friday fold: Centenary migmatite
The Friday fold is a guest submission from Bill Burton, who took the photo of these lovely ptygmatic folds in migmatite in a national park on the 100th anniversary of the founding of the Park Service.
25 November 2013
Monday Geology Picture: Helicopter for Scale Beside Painted Wall, Black Canyon, Colorado
In last week’s “Monday Geology Picture” post I featured the incredible Painted Wall of Black Canyon in Gunnison National Park in Colorado. Last week’s picture was taken by my friend Ray Hall. After my post, fellow geoblogger Ron Schott sent me a link to an impressive GigaPan that he took of Painted Wall. Well, last week I don’t think I quite appreciated the enormous scale of Painted Wall. I stated that …
18 November 2013
Monday Geology Picture: Painted Wall, Black Canyon, Gunnison National Park, Colorado
This week’s Monday Geology Picture shows the absolutely amazing “Painted Wall” of Black Canyon, which is located in Gunnison National Park in Colorado. The picture is courtesy of my friend Ray Hall. I’ve never been to Gunnison National Park, but the park is now high on my list of places I want to visit! The impressive wall consists of very old Precambrian gneiss and schist rock that is cut by …
10 April 2012
Macro GigaPans of Florissant insect fossils
Today, for your viewing pleasure, please check out five macro GigaPans of insect fossils from the Florissant fossil beds in Colorado (34.07 +/-0.10Ma). These amazing specimens were collected by Joe Cancellare, a student working on research supervised by Josh Villalobos of El Paso Community College in El Paso, Texas. Our M.A.G.I.C. project is helping Joe and Josh out by producing macro GigaPans for them. [gigapan id=”102366″] link [gigapan id=”102358″] link …
