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23 January 2015

Friday fold: Rainy Cove, Nova Scotia

Friday fold: Rainy Cove, Nova Scotia

Elizabeth Kosters contributed this week’s Friday fold: It’s from Rainy Cove, Nova Scotia, Canada. Click through to read Elizabeth’s post on the site. Happy Friday!

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16 January 2015

Friday fold: the Ross Sandstone, Ireland

Friday fold: the Ross Sandstone, Ireland

Zoltán Sylvester has contributed today’s Friday fold, an anticline in the Ross Sandstone of Ireland: Click image to go to the source (full sized). Thanks Zoltán! Happy Friday everyone.

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9 January 2015

Friday fold: a surging rippled whale of Grinnell Formation

Friday fold: a surging rippled whale of Grinnell Formation

The Friday fold is asymmetric, overturned, and chock full of primary sedimentary features. Join us in Glacier National Park’s Mesoproterozoic Belt Supergroup.

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2 January 2015

Friday folds: Cabbage Island, Maine

Friday folds: Cabbage Island, Maine

Devonian metamorphic rocks (garnet-bearing gneiss) exposed on the western side of Cabbage Island, Maine: And here it is in GigaPan form: link

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26 December 2014

Friday fold: another gem from the Chancellor Slate

Friday fold: another gem from the Chancellor Slate

That pretty much speaks for itself, I reckon.

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19 December 2014

Friday Fold: Mist Mountain Formation in Canmore, Alberta

Friday Fold: Mist Mountain Formation in Canmore, Alberta

Let’s journey to the Cretaceous today, to see sandstones, shales, and even some coal strata that have been folded during the eastward thrusting that built the Canadian Rockies. Here’s the same fold, in context, shot in GigaPan on a different day, from a different angle. Can you match it up? link Ben Gadd showed me (and my field class) this site last summer. It’s a little west of Canmore. There’s …

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12 December 2014

Friday fold: Miette slate, Alberta

Friday fold: Miette slate, Alberta

The Friday fold returns to Canada, looking at Neoproterozoic slate and quartzite at the southern terminus of the Icefields Parkway. Bonus features include ripple marks, graded beds, cross-bedding, cleavage, and boudinage.

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5 December 2014

Friday folds from the Shenandoah River

Friday folds from the Shenandoah River

My student Josh B. found this beautiful map view of a plunging fold in the bed of the Shenandoah River, as viewed in Google Earth: Josh posted his results on Facebook, and then the other Josh (Joshua Villalobos of El Paso Community College) poked around the area and found some others downstream (north): Here’s a Google Maps link to the site. Check it out!  

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14 November 2014

Friday fold: GSW fall field trip

Friday fold: GSW fall field trip

Last Saturday was the Geological Society of Washington’s fall field trip. Dan Doctor, Alan Pitts, and I led a team of ~20 geologists out to the great new exposures along Corridor H in West Virginia. Here’s the team in front of some of the parasitic anticlines and synclines that decorate the larger structure of the Patterson Creek Mountain Anticline: The strata here are Silurian-aged tidal flat carbonates of the Tonoloway …

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31 October 2014

Friday fold: Four folds from VGFC

Friday fold: Four folds from VGFC

Here are four folds from the Potomac Terrane (or maybe an “exotic unit” that looks like the Potomac Terrane, butted up against the Potomac Terrane) that I saw on the 2014 Virginia Geological Field Conference back in October. It was an overcast, rainy day, so I apologize for the relatively low quality of these images. Happy Friday!

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