You are browsing the archive for February 2015 - Mountain Beltway.
27 February 2015
Friday folds: Three tweets
Back at the beginning of January, I asked for help on Twitter for Friday fold fodder. Here are three responses I got: @callanbentley one of my favorites from South Georgia Island. Have more on the laptop. pic.twitter.com/UaRtxM77Vm — John Van Hoesen (@Taconic_Musings) January 8, 2015 @callanbentley 2 folds from my SC Inner Piedmont MS thesis mapping field work (1997). biotite gneiss and amphibolite. pic.twitter.com/cnoyzwK3cL — Doug (@dropstones) January 8, 2015 …
24 February 2015
New macro GigaPans for exploration
My student Robin has been busy cranking out great new macro GigaPans. Check out a few of these new examples: link link link link link link link link
17 February 2015
A decade of Lola the cat
Today is the 10-year-anniversary of the day I adopted Lola the cat. She’s been a faithful companion for a quarter of my life! Here’s the day it happened, as recorded in my 2005 calendar: Look at this historical document – Titanic opens; Malcolm Gladwell giving a talk; I was still doing woodcut block printing – and I was teaching structural geology at GMU then, too. Earlier in the same week, …
13 February 2015
Friday fold: Ptygmatic Irving Fm., Colorado
Another one from Kim: Kim says: Pygmatic folds in the Precambrian Irving Formation. I think this is 1.7 Ga deformation, late in the Yavapai orogeny, which added various arcs in Colorado to North America. Good place to think about strain ellipses in progressive deformation. Zooming in on the best part, and dialing up the contrast a bit: That’s intense! Seriously strained rocks. What fun!
10 February 2015
Pisolites in the Tansil Formation, Carlsbad Caverns, New Mexico
Pisolites are large primary concretions that develop in backreef or lagoonal settings such as the Permian Tansil Formation of New Mexico, into which is cut the enormous hole called Carlsbad Caverns.
6 February 2015
Friday fold: Ouray Limestone, Colorado
Kim Hannula shares a fold today: Kim says: The rocks folded here mostly the Devonian Ouray Limestone. There’s a fault through the outcrop, and another fault to the left of the photo. Regionally, the faults are mapped as normal faults, mostly with the east (right in photo) side down. Locally, that’s not what I see in this outcrop, which makes this a funky place to look at a fold with …
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.