Friday fold: Turtle Mountain and the Frank Slide
The Friday fold can be found this week at Turtle Mountain, Alberta, where it triggered a massive landslide.
Friday Fold
Friday fold: metagraywacke from the Billy Goat Trail
Here’s a sample that my Physical Geology students see on their field trip to the Billy Goat Trail:
Friday fold: Ventura Avenue Anticline
A guest post today for the Friday fold from my former student Naseem Naghdi, who’s now in southern California: The Ventura Avenue anticline is a fault-propogated fold and is located in the core of (Conoco’s) San Miguelito oil field, which is on the Ventura-Rincon anticlinorium. Carbon dating of seashells have indicated that the terraces range … Read more
Friday fold: mystery calc-silicate from the USGS
The Friday fold is a cast-off specimen from the USGS. A lovely little orphan, its marble and micaceous layers have polished up nicely. Two sides of the sample are presented here.
Friday fold: Sliced BIF from Joburg
The Friday fold is a trio of hand samples of folded banded iron formation from South Africa. Collected in 2012 as float from the “contorted bed” outcrop in downtown Johannesburg, these samples are only now being cut and polished in the lab at NOVA.
Friday fold: below the Dorado Thrust
Here’s a scene from last summer’s Regional Field Geology of the Northern Rockies course… students examining and sketching some tight folds in Cretaceous strata of the Western Interior Seaway, crumpled beneath the Dorado Thrust (a more southerly equivalent of the infamous Lewis Thrust to the north)… I’ve featured this site before, in a previous Friday … Read more
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!
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: Kink band in Lodgepole Limestone, Sacagawea Peak, Bridger Range, Montana
As I’ve mentioned previously, I spent some time making GigaPans this summer out west. Here’s Lily and me on the crest of the Bridger Range, enjoying the clear skies and great geology: When this portrait was taken (by our friend Lindsay), I was shooting this GigaPan: link Try exploring it to see if you can … Read more
Friday fold: Kananaskis Trail, Alberta
The Friday fold returns to Canada this week, with a look at an internally crumpled mountain along Alberta’s Kananaskis Trail…
Friday fold: Archean BIF from Montana
My NOVA colleague Shelley Jaye brought this gorgeous banded iron formation fold back from the Archean of Montana: Gorgeous to think about what this rock represents: (1) an anoxic atmosphere, a world where iron was able to dissolve in seawater; (2) some addition of oxygen, causing the iron to precipitate out as iron oxide minerals, … Read more
Friday fold: Sandy Hollow, Montana
Today, a view to the southwest, from close to the hinge of the main anticline in the Sandy Hollow area, a classic geological field mapping locality in southern Montana: Triassic-aged Dinwoody Formation dominates the main part of the scene. Note how the strike and dip of the positively-weathering strata wrap around. Our Rockies students mapped … Read more
Friday fold: four more Proterozoic folds from the Laramie Range
To this and this, add these: Some interesting fold shapes here. Bob Bauer, who took me to this site, interprets these as interference patterns, evidence of two generations of folding: Happy Friday – for me, there’s only a week of summer break left, and then a week from today, I’ll be back at work.
Friday fold: 2Z
Two Z folds from the Proterozoic rocks of the Laramie Range, Wyoming – you get two since I’ve been so delinquent about blogging over the past month.
Friday fold: Summer sample #1
First sample of the summer – a new “pocket fold” showing Paleoproterozoic deformation in the northern Laramie Range, Wyoming.
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.
Friday fold: South Pass City, Wyoming
Two summers ago, my wife (then my very new wife) Lily and I participated in a two-week workshop for teachers on the energy resources of Wyoming. We also indulged in a visit to a mineral resource site: South Pass City, a site in the southern Wind River Uplift that was the second oldest incorporated town … Read more
Friday fold: flying over the Fort Valley with Michael Collier
Renowned geological aerial photographer Michael Collier gives Callan a lift over the Fort Valley and Massanutten Mountain in his two-seater Cessna.
Friday folds: three lovely specimens from the Carleton College rock garden
I was up in Carleton College (Northfield, Minnesota) for most of the week, working on a new teaching module for the InTeGrate project. On the way between our work area and the cafeteria where we ate lunch, we passed the geology department’s rock garden. They have some great specimens there, some big, some small. Here … Read more
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.