You are browsing the archive for February 2010 - Page 3 of 3 - Mountain Beltway.
15 February 2010
Shear bands in amphibolite
Check out these cool structures in one of the amphibolite bodies exposed along the Billy Goat Trail (C&O Canal NHP, near Potomac, Maryland): Those are shear bands — basically small shear zones that are discretely localized within a larger body of less-deformed rock. Note the grain-size reduction visible in the shear bands, their dextral sense of offset, and their induration (making them more resistant to the forces of weathering and …
13 February 2010
Lola "helps" with grading
My cat loves to sit on, or lie on, paper. Maps are here favorite, but she will take a pile of structural geology labs instead, if that’s all that’s available.
Faulted moraine
Continuing with the recounting of geological sights in the Owens Valley, California, area… This one is in the Pine Creek area. Take a look at this photo: No, that’s not just a portrait of Jeff Lee and his awesome handlebar mustache. Look behind Jeff, on the hillside above. See the little step down that the hill takes? Let’s zoom in: Still can’t see it? Here, allow me to annotate it …
11 February 2010
A small shear zone
Back at NOVA Geoblog, I spent a portion of September and October 2009 reviewing the geological wonders I witnessed as part of a GSA field forum in the Owens Valley of California. However, I got distracted by other things, and never finished the series. I’d like to pick up on that today, looking at a feature which is a typical part of mountain belts like the Mesozoic-aged Sierra Nevada magmatic …
10 February 2010
Snoverkill, 4pm
A look out the back window as DC breaks its annual snowfall record…
8 February 2010
Normal fault in hedgetop snow stratum
Intersection of 16th Street and Columbia Road NW… … a wee bit underexposed, eh? Guess the high albedo blew out my iPhone camera. (glove for scale)
Test post via iPhone
This is a test post to see if I can really make a blog post from my mobile phone…
7 February 2010
All that came before
Mountain Beltway is the new home for Callan Bentley’s geoblogging. NOVA Geoblog will soon be closed, but will be left untouched. Like a fossil, it will be static but present, an artifact from an earlier time. It is hoped that the thousand-plus posts accumulated there will continue to be useful to the Internet-surfing public.
Callan Bentley is Associate Professor of Geology at Piedmont Virginia Community College in Charlottesville, Virginia. He is a Fellow of the Geological Society of America. For his work on this blog, the National Association of Geoscience Teachers recognized him with the James Shea Award. He has also won the Outstanding Faculty Award from the State Council on Higher Education in Virginia, and the Biggs Award for Excellence in Geoscience Teaching from the Geoscience Education Division of the Geological Society of America. In previous years, Callan served as a contributing editor at EARTH magazine, President of the Geological Society of Washington and President the Geo2YC division of NAGT.