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You are browsing the archive for geology Archives - Page 3 of 15 - Mountain Beltway.

29 March 2011

Tillite in outwash

Hoo boy. This one made me yelp… While on the glacial geology of western Pennsylvania trip last Saturday, we visited a gravel quarrying operation. The operators were extracting gravel from a glacial lake delta deposit, and it was full of glacial outwash — sediments washed out from the melting front of the Erie lobe of the Laurentide ice sheet. We were there to look at the Pleistocene features, but several …

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16 March 2011

Video book review: Roadside Geology of Maryland, Delaware, and Washington, D.C. by John Means

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12 March 2011

The morning after

A new resource for the Japanese earthquake is online this morning, a “supersite” similar to the ones that exist for other huge events. Checking it out this morning, I found some interesting stuff. Over night, there have been more aftershocks, and here’s the most recent 600 or so events in the area, taken from IRIS’s interactive map. You can see the big circle that represents yesterday’s main shock: Explore the …

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21 February 2011

Mount Washington 1

Callan begins a new series on the geology of Mount Washington, New Hampshire with a look at a roadside outcrop of metamorphic rock bearing enigmatic inclusions. Tourmaline-bearing pegmatites are also spotted.

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7 February 2011

Geologist scam

I just got an e-mail which screams “scam!” Apologies for having to reach out to you like this, but I made a quick trip to the UK and had my bag stolen from me with my passport and credit cards in it. The  embassy has cooperated by issuing a temporary passport, I just have to pay for a ticket  and settle Hotel bills. To be honest,i don’t have money with …

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26 January 2011

The making of Baker’s Quarry

So here’s how I made that cake I showed you Monday. Step 1: Collect the necessary ingredients: (Nice job with the stitching, Photoshop… jeez!) Step 2: Clear your schedule and start baking. My first layer was to be “the basement complex” and so I wanted something marbled in appearance. Mixing chocolate-powder-stained batter with regular yellow batter was the method, and I threw chocolate chips into the mafic batter and “white …

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24 January 2011

East wall of Baker’s Quarry

Callan showcases his contribution to this month’s Accretionary Wedge blog carnival. The theme of the Wedge is “Bake Sale,” and Callan shows a cake he “discovered,” describing its geologic origin in detail. This would be tongue in cheek, except that his mouth is already full of dessert.

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20 January 2011

A warm, glowing feeling

Just got this in an email: “Hi professor Bentley, This is [redacted], I had you for Geology last Spring. I just wanted to email you to first off, thank you, and second off, to ask some questions. Before I took your class Science was my worst subject , and I did everything to avoid taking it. I ended up needing it so I chose Geology since i was very slightly …

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12 January 2011

Experimental vs. historical science, and environmentalism

A diagram on “how science works” betrays an “experimentalist” bias. This sets Callan off on a rumination on the much-maligned validity of historical science, and that leads to a discussion of the Big Experiment, which is humanity’s influence on the Earth system.

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3 December 2010

Outcropedia edits

Outcropedia launched yesterday, and I think it has the potential to be a cool resource for geologists and amateur geology aficionados. I’m particularly excited about the strong structural flavor of the featured outcrops so far. (The site was initiated by three structural geologists.) However, there are some issues that will need to be resolved. Ron Schott pointed out one — misplacing outcrops. There’s also a functional issue of having to …

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