Friday fold: crumpled red argillite
Red argillite (Grinnell Formation?) and white quartzite strata from Glacier National Park, Montana. Heavily adorned with lichens… With bedding traced out… Happy Friday to you!
national parks
Friday fold: recumbent fold at Two Medicine Lake, Montana
Here’s a photo from Tom Biggs (University of Virginia), taken on the NOVA Rockies field course last summer. It shows a recumbent fold along the Front Range of Glacier National Park, in Montana, just north of Two Medicine Lake. I hope you get some ‘recumbent’ time this weekend… I know I could use some rest. … Read more
Friday fold: a lovely three-dimensional exposure
The Friday fold series returns to Kootenay National Park in Canada for a look at some folded Cambrian limestones.
Stone tools of the Piney Branch quarry, DC
Archaeology meets geology in this visit to the Piney Branch valley of Rock Creek Park in Washington, D.C. Cretaceous deposits of cobbles of Cambrian quartzite were quarried by Native Americans and modified into tools thanks to the fact that they break with a conchoidal fracture.
Friday fold: Rorschach blot
The broad symmetry (with smaller-scale variations) of this fold caught my eye as particularly artful when I saw it (at Howard’s recommendation) last summer in the Canadian Rockies: Kootenay National Park, British Columbia, Canada. I see a butterfly. What do you see? Happy Friday.
Friday fold: Another from the depths of Mosaic Canyon
More folds from the charismatic Noonday Dolostone in Mosaic Canyon, Death Valley National Park, California: Annotated: Happy Friday!
Friday fold: Mosaic Canyon
For the Friday fold today, let’s return to the warmth of Mosaic Canyon in Death Valley National Park, California: Can you see it there? Let’s zoom in on the dark area in the middle of that first photograph…. Ahh! Now that’s a fold to end the week on! Enjoy the weekend, everyone.
Friday fold: clear evidence of the work of the Intelligent Folder
Yesterday’s post showcasing my conversational critique of Intelligent Design got a lot of attention, including tweet love from @NCSE and @BadAstronomer, and a blog post at Pharyngula. So, at the risk of overkill, I decided to have a little fun with the Friday fold… Check out this fold that I found in float of Purcell … Read more
Friday fold: Mosaic Canyon Monster
While out in Death Valley with my Field Studies students last March, we encountered an extraordinary fold in Mosaic Canyon. Check this thing out: The rock is the Noonday Dolostone (“Noonday Dolomite” in mineralogically biased argot). It may be hard to make out what’s what there… So let me assist with a little annotation, tracing … Read more
AW50: The tweaked pinkie
My AGU Blogosphere neighbor Evelyn of Georneys fame is hosting this month’s Accretionary Wedge. Her topic? “Field camp memories”… I never attended a bona fide field camp myself, but I attended a lovely “regional field geology” course that my undergraduate alma mater, the College of William & Mary, put on each summer in the Colorado … Read more