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18 August 2012

Migmacatization

Evelyn put up a cat photo on Geokittehs earlier today, and it reminded me of anatexis, the process of partial melting. Anatexis is my favorite way to produce a migmatite. In this model, the light-colored (felsic) ginger cat is derived from the partial melting of another cat, partly dark (mafic) and partly felsic (ginger). Where the low-melting-temperature minerals have been extracted, the source cat is much darker. Fresh injections of …

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13 April 2012

Friday folds: Turpan Depression

Rob Simmon of NASA’s Earth Observatory is the source for today’s Friday folds. Last week, he tweeted this image to me: That’s a excellent example of the outcrop pattern of a more or less horizontal outcrop of folded rock. To the north is a synform (notice that where streams have eroded it, the bull’s-eye pattern takes a notch inward toward the center of the structure), and to the south, a …

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5 March 2012

Scott Mandia, climate communicator

Callan has a conversation with Scott Mandia, a community college professor working on the national level to improve the public’s understanding of climate science.

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4 February 2012

The top 10 reasons I love structure

In the past 24 hours, Erik Klemetti and Siim Sepp both gave us their top ten reasons for loving their branches of geo-science. Their lists demonstrated their passion for (respectively) volcanoes and sand, and so I feel inspired to make a list, too. Here are the top 10 reasons I love structural geology: 10. It’s something. What I mean by this, is: If you’re going to go into geology or …

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31 January 2012

Crisp limestone syncline

Nice straight-limbed syncline in the Helderberg Group of West Virginia (Devonian limestones, mainly): Alan Pitts shot a sweet GigaPan of this outcrop which you can explore here, or you can just look at this zoomed-in detail: Aaron Barth is down there in the lower right corner for scale.

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5 December 2011

AGU 2011, day 1

I got to San Francisco on Saturday afternoon, flying in on the same flight from DC as Rob Simmon and Maria-José Viñas. MJ and I took the BART downtown, and then met up with Jess Ball for Thai dinner and a yummy dessert of banana wrapped in roti with Nutella and coconut ice cream. Then, jet lag informing me it was time for rest, I went to bed. I had …

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9 November 2011

William & Mary geology: 50th anniversary

The geology program at the College of William & Mary turned 50 years old this year, and last weekend they held a party to celebrate. Of the 800 or so geology majors the department has produced in 50 years, about 100 came to this event – that’s a pretty great ratio, I think: 1 out of every 8 alumni made the trek back to Williamsburg to pay tribute to this …

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1 November 2011

Geoblogs as a device for student engagement

Here’s the talk I gave at GSA last month: [youtube=”http://www.youtube.com/watch?v=oXt5aZIu5Xk”]   It’s presented here at a slower pace than the actual talk was, since I didn’t have to run and catch a plane 45 minutes after presenting it, but there are some PowerPoint bugs with some of the animations. Oh well – recording it and putting it online is more than 99.9% of GSA presenters ever do to share their …

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21 September 2011

Geoblogger/Geotweep Rendezvous, summer 2012?

At the end of the summer, there was a conversation on Twitter about having a meet-up (“rendezvous” sounds more authentic, it was pointed out) for folks involved in geology social media: stuff like geoblogs and Twitter, but pretty much open to whoever’s into meeting up in some interesting place and exploring some geology together. Following up on the Twitter conversation, I’ve traded a few e-mails with one of the folks …

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27 August 2011

Friday fold addendum

Lee Allison, State Geologist of Arizona and exemplar of public outreach via blogging, sent me an e-mail yesterday regarding that awesome coastal Greenland shot by Alistair Knock that I featured as the Friday fold. Lee, like many of you, found the image entrancing and intriguing, and as he explored the unannotated version, he made some discoveries. In this e-mail, Lee pointed out a few more faults that I hadn’t noticed. …

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