NOVA Geoblog
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| Blog Name: | NOVA Geoblog |
| Url: | http://www.nvcc.edu/home/cbentley/geoblog/ |
| Language: | English |
| Topics: | geology, earth science, teaching |
| Description: | Earth science observations, news, photos, teaching, & commentary by Callan Bentley |
| Popularity: | 42 Followers |
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Cooling columns in the Bishop Tuff
Shall we return now to the volcanic tableland north of Bishop, California?Yes, let's shall.Today's topic: cooling columns in the Bishop Tuff. Like all volcanic rocks, the Bishop Tuff erupted hot and cooled off as it "set." This change in temperature led to a change in volume, and the upper welded layer, known affectionally to its friends as "Ig2," lost enough volume and was stiff enough that it developed a set of polygonal fractures, which propagated downward, mostly vertically. This divided up the Ig2 into blocky columns, which now topple over where exposed along normal
Shall we return now to the volcanic tableland north of Bishop, California?Yes, let's shall.Today's topic: cooling columns in the Bishop Tuff. Like all volcanic rocks, the Bishop Tuff erupted hot and cooled off as it "set." This change in temperature led to a change in volume, and the upper welded layer, known affectionally to its friends as "Ig2," lost enough volume and was stiff enough that it developed a set of polygonal fractures, which propagated downward, mostly vertically. This divided up the Ig2 into blocky columns, which now topple over where exposed along normal
New Shenandoah map gets place of honor
I hung up my new copy of the Geological Map of Shenandoah National Park Region, Virginia in my office, using neodymium magnets (the best!) to "pin" it to a metal shelf. Gosh, it's beautiful.
I hung up my new copy of the Geological Map of Shenandoah National Park Region, Virginia in my office, using neodymium magnets (the best!) to "pin" it to a metal shelf. Gosh, it's beautiful.
Billy Goats' Portrait
A couple of shots of the Thursday Physical Geology lab section, out hiking on the Billy Goat Trail:A great group of students.... Photos courtesy of Judi Scharfman.
A couple of shots of the Thursday Physical Geology lab section, out hiking on the Billy Goat Trail:A great group of students.... Photos courtesy of Judi Scharfman.
Mapping opportunity in Yellowstone NP
Got this yesterday via the NAGT newsletter:REU Project in Yellowstone National ParkGreetings from Montana! We would appreciate your help in advertising to your students an NSF/GEO site project we will be running this summer on Evolution of the Precambrian Rocks of Yellowstone National Park (Dave Mogk, Paul Mueller, Darrell Henry, and Dave Foster PIs). Please visit the project website for further details: https://webmail-1.nvcc.edu/exchweb/bin/redir.asp?URL=http://serc.carleton.edu/ This project will be a comprehensive research experience that will include:
Got this yesterday via the NAGT newsletter:REU Project in Yellowstone National ParkGreetings from Montana! We would appreciate your help in advertising to your students an NSF/GEO site project we will be running this summer on Evolution of the Precambrian Rocks of Yellowstone National Park (Dave Mogk, Paul Mueller, Darrell Henry, and Dave Foster PIs). Please visit the project website for further details: https://webmail-1.nvcc.edu/exchweb/bin/redir.asp?URL=http://serc.carleton.edu/ This project will be a comprehensive research experience that will include:
Two different ways of getting round grains
On my Historical Geology field trip to the Massanutten Synclinorium, we observed oolites (ooids) in Cambrian-aged limestones deposited in the Sauk Sea. Like these:Now the students have submitted their papers on that field trip. Grading the papers, I realized that some of my students were confusing how ~spherical oolites form (through chemical deposition on moving grains) with the perhaps more intuitive process by which clast
On my Historical Geology field trip to the Massanutten Synclinorium, we observed oolites (ooids) in Cambrian-aged limestones deposited in the Sauk Sea. Like these:Now the students have submitted their papers on that field trip. Grading the papers, I realized that some of my students were confusing how ~spherical oolites form (through chemical deposition on moving grains) with the perhaps more intuitive process by which clast
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