You are browsing the archive for Friday Fold - Mountain Beltway.
6 December 2013
The Friday fold can be found this week at Turtle Mountain, Alberta, where it triggered a massive landslide.
22 November 2013
Here’s a sample that my Physical Geology students see on their field trip to the Billy Goat Trail:
15 November 2013
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 between 1800 – 5600 years old and it was deposited from deep marine turbidity currents. Sea …
8 November 2013
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.
18 October 2013
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.
11 October 2013
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 fold. Photo courtesy of Tom Biggs, University of Virginia.
27 September 2013
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!
20 September 2013
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. Happy Friday!
13 September 2013
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 find today’s Friday fold: a kink band in the Lodgepole Limestone (a thinly banded unit) …