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20 January 2016

Six new GIGAmacro images of sedimentary rocks

Here are some new “virtual samples” for you to check out: Dessication cracks in Tonoloway Formation (Silurian): Link Image by Callan Bentley Random conglomerate (unknown age and formation): Link Image by Robin Rohrback Skolithos trace fossils (tops) in Hampshire Formation (Devonian): Link Image by Callan Bentley Crinoid calyx fossil (unknown age and formation): Link Image by Callan Bentley Iron oxide staining in Tuscarora Formation quartzite (Silurian): Link Image by Callan …

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15 January 2016

Friday fold: Harpers Ferry

Friday fold: Harpers Ferry

The geology east of Harpers Ferry, West Virginia, is cool. It’s Blue Ridge rocks, from basement to the cover sequence, tilted to the west and broken and repeated by the Short Hill Fault. Here’s a look at a detail of the Geology of the Harpers Ferry quadrangle by Southworth and Brezinski (1996). So there’s a fault! Good – but the title of this post isn’t “Friday fault” – Where’s the …

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6 January 2016

Slumped boulder on Marshall’s Beach, San Francisco

Slumped boulder on Marshall's Beach, San Francisco

The week before the AGU Fall Meeting, San Francisco experienced heavy rain and strong coastal wave action. These two phenomena liberated a big boulder of serpentinite on Marshall’s Beach. As it moved downhill, it opened up a scarp with views into the colluvial soil horizons.

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29 December 2015

Serpentinite mélange on Marshall’s Beach

Serpentinite mélange on Marshall's Beach

South of the Golden Gate Bridge in San Francisco, there are beachside exposures of serpentinite mélange: tectonically sheared-out former oceanic crust accreted to western North America as part of an accretionary wedge.

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28 December 2015

Corona Heights Fault, San Francisco

Corona Heights Fault, San Francisco

At the end of the AGU Fall meeting, Callan visits the Corona Heights “mirror” fault, renowned for its gorgeous slickensides. Explore the site in photos in GigaPans.

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23 December 2015

Four new GIGAmacro images of sedimentary rocks

It’s been a week and a half since Mountain Beltway has seen any publishing action, given the overlapping timesucks of the AGU Fall Meeting and the end of the semester. But now I’m back in the Appalachian mountain belt, and my grades are all in, and I have time to think about indulgences like blogging again. Let me make up for it now with a suite of four new macro …

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1 December 2015

Which way’s up? Check cavity fills.

Which way's up? Check cavity fills.

When snail shells are deposited in a bunch of sediment, they serve as tiny architectural elements, with a “roof” that protects their interiors. Any sediment mixed into the shell’s interior will settle out (more or less horizontally), and then there will be empty space (filled with water, probably) above that. As burial proceeds and diagenesis begins, that pore space may be filled with a mineral deposit, such as sparry calcite. …

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18 November 2015

Beach sand of coastal Maine

You could use a macro GigaPan of some pretty sand, I think. Link That’s sand from near Acadia National Park, in Maine. Exploring it, you can find both small chunks of Acadian granite, and green rods that are sea urchin spines. It’s fun – check it out.

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27 October 2015

Corridor H virtual field experience

Corridor H virtual field experience

My Historical Geology class was in for a new experience for the semester’s capstone field trip. Before we headed out into the field (to the exceptional roadcuts along Corridor H in Grant and Hardy Counties, West Virginia), we had them examine all the outcrops virtually, in the comfort of the classroom, using digital imagery. I say “we” because this initiative was a collaboration with my colleague Alan Pitts, who developed …

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21 October 2015

Seven new GigaPans from Axel Heiberg Island, Nunavut

Seven new GigaPans from Axel Heiberg Island, Nunavut

One of the cool things about my plan for the GEODE grant from NSF is to put GigaPan imaging systems in the hands of people who will take them to cool places. I purchased five loaner GigaPan rigs, and they have gone out in the field with various people, but I think that the images I will show you today are the coolest we’ve yet produced. All seven of them …

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