Advertisement

You are browsing the archive for Friday Fold Archives - Page 2 of 40 - Mountain Beltway.

26 July 2019

Friday folds: Broom Point, Gros Morne National Park, Newfoundland

Here’s a look at some of the outcrops at Broom Point, within sight of the famous uplifted fjord called Western Brook Pond: The limestone beds here are Ordovician in age, and they dip to the east: In places through there are folds to be spotted in the beds:

Read More >>

No Comments/Trackbacks >>


19 July 2019

Friday fold: Banded iron formation from the University of Wisconsin geology museum

A final Friday fold from Madison, Wisconsin: this one a slab of cut and polished banded iron formation from Australia: What exquisitely beautiful rock! Happy Friday!

Read More >>

3 Comments/Trackbacks >>


5 July 2019

Friday fold: the University of Wisconsin geology museum stained glass window

Today’s Friday fold is rendered in stained glass, along with a bunch of other geological details, as seen at the entrance to the geology museum at the University of Wisconsin (site of our previous Friday fold): Beautiful work!

Read More >>

1 Comment/Trackback >>


21 June 2019

Friday fold: The University of Wisconsin rock garden

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 …

Read More >>

No Comments/Trackbacks >>


14 June 2019

Friday fold: kinked cleavage at Harpers Ferry

Last weekend was the annual meeting of the eastern section of the National Association of Geoscience Teachers. On Friday afternoon, we visited Harpers Ferry, West Virginia, and my colleague Beth Doyle led a great field trip to examine the rocks exposed there. This was my favorite outcrop we saw: Here is a close up of this outcrop, which is framed by (anthropogenic) rock wall: Dipping shallowly from upper left to …

Read More >>

3 Comments/Trackbacks >>


31 May 2019

Friday fold: Point Arena, California

It’s Friday, and I’m grateful that Bret Leslie of the NRC has stepped up with a Friday fold contribution from coastal California: Bret says this outcrop is: from my trip last month to the Sonoma and Mendocino coast. The first is the cliff below the Pt. Arena lighthouse. The marine deposits (now a marine terrace) are unconformably on top of the folded Miocene sedimentary rocks in the second photo. Here …

Read More >>

No Comments/Trackbacks >>


24 May 2019

Friday fold: Riffelhorn (+xenolith)

Naomi Barshi shares this “deskcrop” Friday fold… Naomi says she found this fold: near the Riffelhorn, Gornergrat, above Zermatt, Switzerland. The sample has befriended my other show-off sample of a mantle xenolith from San Quintin, Baja California. Thanks for sharing, Naomi! The xenolith is a nice bonus!

Read More >>

No Comments/Trackbacks >>


17 May 2019

Friday fold: Found folds

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 …

Read More >>

No Comments/Trackbacks >>


3 May 2019

Friday fold: Monarch Canyon

When a dike is subjected to shear, how does it deform? A guest Friday fold from Darrel Cowan of the University of Washington teaches a nice little lesson. Join the field trip in Monarch Canyon of Death Valley National Park…

Read More >>

No Comments/Trackbacks >>


26 April 2019

Friday fold: Black Sands Beach

The Friday fold can be found in a boulder of gray chert layers on Black Sands Beach, at Marin Headlands in California.

Read More >>

1 Comment/Trackback >>