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23 February 2018

Friday fold: some Google Earth views of Namibia

We return today to the scene of last week’s Friday fold, for it turns out that you can see some additional awesome folds from outer space (via Google Earth). Do not adjust your monitor: these patterns mean show up a stark and wavy reality!

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16 February 2018

Friday fold: Zerrissene turbidite system, Namibia

The University of Maryland’s Jay Kaufman makes our Friday fold happen by sharing some images of folds from the Zerrissene turbidite system of northwestern Namibia.

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9 February 2018

Friday fold: Taiwanese metasediments

This Friday, in search of a Friday fold, we head to Taiwan, not far from the epicenter of this week’s destructive earthquake(s).

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2 February 2018

Friday fold: 3D model from the Portsoy Shear Zone

The Friday fold is a really cool 3D model of differentially-weathered calc-silicate rocks in Scotland that were folded during the Caledonian Orogeny.

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26 January 2018

Friday fold: eastern Andes

This image graces the cover of the new report, Challenges and opportunities for research in tectonics: Understanding deformation and the processes that link Earth systems, from geologic time to human time. A community vision document submitted to the U.S. National Science Foundation: Make it bigger by clicking it The photo is of a landscape in the Eastern Cordillera of the Andes, southern Peru, showing folded Permian carbonates cut by a …

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19 January 2018

Friday fold: crumpled quartz vein from VGFC

Remember the Virginia Geological Field Conference from back in October? Well here’s a folded quartz vein we observed along a small shear zone in the Blue Ridge basement complex. There are two views of it, from approximately perpendicular points of view: These rocks are Mesoproterozoic, but the vein would obviously be younger than that, and the deformation is likely Alleghanian in age (late Paleozoic). Annotated copies of the photos:

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12 January 2018

Friday folds: Hayden Butte (“A Mountain”), Tempe

In keeping with the Arizonarific theme of this week’s posts (thanks to my participation in the 2018 Structural Geology and Tectonics Forum), I thought I would wrap up my ‘geology of the Phoenix area‘ posts with a walk I took on my last day there. This was to what Google Maps calls “Hayden Butte,” but the locals call “A Mountain.” Not “a mountain,” but “the mountain called ‘A‘.” It has …

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5 January 2018

Friday fold: Scott Paterson in Tasmania

My friend Vali Memeti posted this photo of her husband Scott Paterson examining some folded rocks on the coast of Tasmania last week. It looks like Vali and Scott enjoyed a fun excursion to this “Even Further” Down Under location. This is the Sulphur Creek geologic site, part of a geocache suite called “Created from Chaos,” though I don’t get too much additional information from their website. Presumably the rocks …

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8 December 2017

Friday fold: Alpine cross sections by Albert Heim

The Friday fold is a figure from a 1922 book about the geology of the Alps by Swiss structural geology genius and artistic master Albert Heim. Marvel at his gorgeous depiction of the internal and long-since-eroded structure of these mighty mountains.

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24 November 2017

Friday fold: Idaho Springs Fm. amphibolite

Here’s a guest Friday fold from reader Carl Brink: Carl tells me that this is: Precambrian Amphibolite schist float boulder from the Idaho Springs Formation in Rist Canyon west of Fort Collins, Colorado.  Knife is 2.25 inches long. Thanks for sharing, Carl!

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