Posts treating: "folds"
Tuesday, 19 November 2019
Mountain belts like the Himalaya and the Alps formed when continental crust was squeezed, deformed and uplifted during the collision of two continental plates. The Himalaya, which is the deformed edge of the Indian continental plate is made up of different terrains. The Tethyan Himalaya is the northernmost terrain whose northern edge meets the Asian continental plate. The Greater Himalaya
I’m at a workshop in Madison, Wisconsin, this week. I took the lunch hour today and walked over to the geology department to check out their rock garden and geology museum. I was pleased to find a Friday fold in the rock garden: a limestone with cherty nodules/layering that has been folded…. Bonus: some nice bookshelfing/boudinage of the chert: …And here’s another boulder of the same lovely stuff. And here …
The post Friday fold: The University of Wisconsin rock garden appeared first [...]
This week, for Friday folds, I offer up some random folds that have passed my perceptual transom this week. First up: In the new Netflix series Our Planet, in episode 7 (Fresh Water), an anticline/syncline pair makes a brief appearance as David Attenborough discusses glaciers as a reservoir for fresh water. Here is a screenshot: I’m not sure where this is in the world: Greenland? Antarctica? Let me know in …
The post Friday fold: Found folds appeared first on Mountain Beltway.
Friday is that special day of the week where we take a break from our hurried lives and gaze longingly at great photos of folded rocks in exotic corners of the world. Today, we return to Oman, and we say, "Oh, man!"
The post Friday folds: two more from Oman and Chuck Bailey appeared first on Mountain Beltway.
The William & Mary "Rock Music" class has returned from Oman, bearing cultural insights and Friday fold photos!
The post Friday fold: Two spectacular folds from Oman appeared first on Mountain Beltway.
Four Friday folds from Marli Miller's online photo archive of geological images.
The post Friday folds: more Marli Miller appeared first on Mountain Beltway.
Scott White (@SeafloorScott) of the University of South Carolina pitched in with today’s Friday fold: Click to enlarge This shows a section of high grade gneiss in the spillway of the Saluda Dam in Columbia, South Carolina. Zooming in there, you can see a nice fold hinge on the left edge: Although I don’t know the precise location of this outcrop, I did a bit of internet sleuthing… According to …
The post Friday fold: Saluda Dam, South Carolina appeared first on Mountain Beltway.
For the final Friday fold of 2018, we return to Utah's Slate Canyon, where "Mountain Beltway" reader Octavia Sawyer shares an anticline with parasitic folds shaped like "sea serpents."
The post Friday fold: more from Utah appeared first on Mountain Beltway.
The countryside near Provo, Utah yields a terrific Friday fold in an outcrop of Cambrian limestone.
The post Friday fold: loopy limestone in Utah appeared first on Mountain Beltway.
Reader and former student Paxton DeBusk shared this lovely folded gneiss with me at the conclusion of the Virginia Geological Field Conference a few weeks ago: That’s a lovely hand sample, with a high folding:volume ratio! Happy Friday, all
The post Friday fold: gneiss from the Southside Virginia Piedmont appeared first on Mountain Beltway.
It's Friday; time to stretch our backbones out in anticipation of the weekend. Let's look to a backboney-named Friday fold for a little inspiration... ...And what's that, just down the road? Another fold, in need of a catchy name...
The post Friday fold: the Devil’s Backbone and its neighbor appeared first on Mountain Beltway.
It's Friday and that means it's time for a fold. Today we head to Cottonwood Canyon, Utah, with reader Octavia Spencer, for a lovely antiform.
The post Friday fold: Big Cottonwood Fm., Slate Canyon, Utah appeared first on Mountain Beltway.
It’s Friday! Here’s a lovely sight, contributed by reader Fred Atwood: Those are quartz veins in one of my favorite local rock units, the Mather Gorge Formation. Fred reports, This is at Madeira School in Great Falls between Black Pond and the Potomac. The rocks around Great Falls, particularly those on the Billy Goat Trail’s “A” Loop, are exemplary in many regards. That’s why I am taking my Physical Geology …
The post Friday fold: quartz veins in metagraywacke of the Mather [...]
The first Friday of September calls out for a fold. The Burle Business Park in Lancaster, Pennsylvania has an answer - several of them, in fact!
The post Friday folds: Continuing contorted Conestoga carbonates appeared first on Mountain Beltway.
Break out your paddle and sunhat. We're going kayaking on Lake Moomaw, in search of Friday folds...
The post Friday folds: Moomaw Reservoir outcrops appeared first on Mountain Beltway.
Today we feature a famous recumbent, chevron anticline near Hill City, South Dakota has been featured as a Friday Fold or not, but thought I would give it a go. The rocks are Proterozoic metagreywacke turbidites with 70 complete or partial Bouma sequences. This is believed to be a late (D4) fold in the Black Hills related to upward doming associated with the emplacement of the Harney Peak Granite, which …
The post Friday fold: a recumbent set of turbidites in the Black Hills appeared first [...]
Hiking Siyeh Pass in Glacier in Glacier National Park on Tuesday with my Montana State University field course, we spotted a few new folds in the Empire Formation (a transitional unit between Helena Formation and Grinnell Formation). Here is one of the students serving as a sense of scale, with interesting features on either side of him: On the left, there are small scale folds in a regular little train: …
The post Friday fold: new folds from the Empire Formation, Glacier National Park [...]
Another guest Friday fold (keep ’em coming, folks!) – This time from Eric Pyle of James Madison University: This is a weathered outcrop of the Connemara Marble in western Ireland, about a meter wide. Thanks for sharing, Eric!
The post Friday fold: Connemara Marble, Ireland appeared first on Mountain Beltway.
Marli Miller is a senior instructor at the University of Oregon. She is the author of Roadside Geology of Oregon and (with Darrel Cowan) Roadside Geology of Washington. She’s also a very talented geological photographer. She launched a website recently to showcase her work and make it available for instructors: Geology Pics. After chatting with Marli a bit in Flagstaff at the Rocky Mountain / Cordilleran section meetings of GSA …
The post Friday fold: a quartet from Marli Miller’s [...]
The Friday fold takes us to the French Mediterranean island of Corsica. Are you ready to dip into the blueschist facies in search of sheath folds?
The post Friday fold: Corsican blueschist sheath fold appeared first on Mountain Beltway.