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24 May 2011

Three other interesting gravestones

While exploring the Rock Creek Cemetery last week, I noticed a couple of other interesting graves. This one, made of limestone, shows nice “reverse” cross-bedding: Here; I dialed up the contrast a bit to highlight these cool primary structures: It’s “reverse” because the tilting direction of the cross-beds switches from left (at the bottom) to right (for the bulk of the section). Ergo, the current started off flowing towards the …

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22 May 2011

New hallway display: geologic provinces of northern Virginia

Callan shows off a new hallway display in his building at Northern Virginia Community College, showcasing the numerous geologic provinces of northern Virginia (as well as adjacent mid-Atlantic states).

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21 May 2011

The grave of Charles Walcott

Callan pays a visit to the grave of celebrated paleontologist and geological administrator Charles D. Walcott.

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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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7 January 2011

Friday fold: snow on a roof

The weekly example of a fold is especially… “cool” this week.

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28 October 2010

The tale of the hammerheaded copper tadpole

Okay, now just what the heck is going on in these pictures? (All of them can be enlarged by clicking through.) The photos are different views of the same crystal. It is a broken hexagonal prism of quartz, fading to amethyst at the distal end, found by Doug Dupin of northwest DC during the excavation that led to the Palisades Museum of Prehistory. The crystal is about 3.5 cm long, …

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23 June 2010

The routine

It’s that time of year for me… summer’s here, and I’m winding up my duties at NOVA in preparation for some travels. We leave Sunday night for two weeks in Turkey, followed by my regional field geology course in Montana (also two weeks), followed by some family time and mountain climbing in New Hampshire (three weeks), including hiking the Presidential Range. This summer, as I have done for the past …

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13 June 2010

DC fossil website is now live

Chris Barr’s informative website of the “Accidental Museum of Paleontology” that can be found in D.C. building stones is now live. You should go and check it out, and if you ever visit the city, you can use it as a guide for your tourism.

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6 June 2010

Uniformitarian

Heat-stressed map of the Chesapeake Bay / Washington, DC region, as seen at Kenilworth Aquatic Gardens. Looks like mudcracks, eh? Similar stresses; similar strains.

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25 May 2010

Vector maps by Eric Fischer

“The Geotaggers’ World Atlas #8: Washington, DC” by Eric Fischer If you like maps, you should go check out these images by photographer Eric Fischer. (via here) The different colors represent different modes of transportation: Black is walking (less than 7mph), red is bicycling or equivalent speed (less than 19mph), blue is motor vehicles on normal roads (less than 43mph); green is freeways or rapid transit.

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