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You are browsing the archive for 2016 June.

19 June 2016

3D model of onion-skin weathering

I collected a photo set at the Giant’s Causeway to show the “textbook” examples of spheroidal (“onion skin”) weathering exposed on the road down to the causeway. My student Marissa Dudek used the photo set and Agisoft Photoscan to make a great 3D model of the site. She posted it on Sketchfab yesterday evening. Check it out! Photoscan model by Marissa Dudek Great work, Marissa!

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18 June 2016

Two virtual weathered-out dikes in a fjord in eastern Iceland

Two 3D models for you today, both produced by my student Marissa Dudek, using photo sets I gathered in Iceland: Photoscan model by Marissa Dudek (That one has paleomag holes drilled into it!) Photoscan model by Marissa Dudek (That one I’m particularly pleased with. Given the circumstances of image acquisition, this is a very good result!)

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17 June 2016

Friday fold: isoclinal flow structures in Icelandic lava

While soaking at some fine outdoor hot springs in southern Iceland (near Höfn) last week, I spied a Friday fold on the rock wall above the hot pots: Iceland is not a place where we would expect to find ductile folds in already-lithified rocks, so I’m guessing that these are folds related to flow in the lavas as they erupted at the surface. Happy Friday!

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16 June 2016

Dimmuborgir, Lake Mývatn, Iceland

Last week, I was in Iceland, driving around the country’s Ring Road and checking out its amazing geology with my family. We had a great time in particular exploring in the Lake Mývatn region, on the country’s subaerial expression of the Mid-Atlantic Ridge. Lake Mývatn itself is in a rift basin, peppered with a great variety of volcanic and hydrothermal features. One spot we enjoyed a short stroll was in …

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10 June 2016

Friday fold: Mesoscopic structures in the Lightning Creek Schist

There are some structural goodies here at the confluence of the Rapid River and the Salmon River in west-central Idaho. I visited these outcrops three weeks ago on a field trip after the Rocky Mountain section meeting of GSA. The rocks are the Lightning Creek Schist, a schist that’s part of the Wallowa Terrane, an accreted chunk of crust that docked with western North America during the Mesozoic. Here is …

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Green River Formation stromatolite – a virtual sample

Today concludes a weeklong run of virtual samples. For the past five days, I’ve been presenting examples of a visualization combination that leverages the advantages of the GIGAmacro system with the 3D ‘virtual sample’ perspective of the Sketchfab-hosted model: the same sample presented in both formats. Today, we finish up with a stromatolite from the hypersaline Wilkins Creek member of the Eocene-aged Green River Formation of southwestern Wyoming: Link GIGAmacro by …

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9 June 2016

Storm deposits in Tonoloway Fm. limestone – a virtual sample

Our series of  virtual samples continues! This week, I’m presenting examples of a visualization combination that leverages the advantages of the GIGAmacro system with the 3D ‘virtual sample’ perspective of the Sketchfab-hosted model: the same sample presented in both formats. Today, we feature a lovely slab of limestone, chock full of fossil material, and showing both primary sedimentary structures like graded bedding and cavity fills (both geopetal indicators), but also …

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8 June 2016

Differential weathering in dolostone – a virtual sample

Our series of  virtual samples continues! This week, I’m presenting examples of a visualization combination that leverages the advantages of the GIGAmacro system with the 3D ‘virtual sample’ perspective of the Sketchfab-hosted model: the same sample presented in both formats. Today, we feature a differentially weathered dolostone. Link GIGAmacro by Callan Bentley Photoscan model by Marissa Dudek Differential weathering (i.e., different rates of weathering for different substances subject to the …

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7 June 2016

Variably-cemented conglomerate – a virtual sample

Here’s another example of a visualization combination that leverages the advantages of the GIGAmacro system with the 3D ‘virtual sample’ perspective of the Sketchfab-hosted model: the same sample presented in both formats. In this case, it’s a lovely example of a conglomerate that I found in our lab at NOVA, showing variations in the level of cementation around a central ‘nucleus’. Link GIGAmacro by Callan Bentley Photoscan model by Marissa …

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6 June 2016

Cleavage refraction in Konnarock Fm. rhythmites – a virtual sample

Here’s a visualization combination that leverages the advantages of the GIGAmacro system with the 3D ‘virtual sample’ perspective of the Sketchfab-hosted model: the same sample presented in both formats. In this case, it’s a lovely example of cleavage refraction going from meta-clay-shale (now ‘slate’) through a graded bed of fine sand and silt. Link GIGAmacro by Callan Bentley Photoscan model by Marissa Dudek The sample is of the Neoproterozoic Konnarock …

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