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20 December 2013
Friday fold: Another from Cristo Rey
The laccolith of Cristo Rey, at the Chihuahua / Texas / New Mexico triple point, is host to some cool geology. It’s cored by the Campus Andesite (47 Ma, Eocene) but surrounding the intrusion are a slew of sedimentary rocks, include the Turitella-bearing limestones of the Buda Formation and the shales and sandstones of the Mesilla Valley Formation. My colleague and friend Joshua Villalobos of El Paso Community College in …
3 December 2013
El Paso geology via GigaPan
This spring, I traveled to west Texas to assist Joshua Villalobos of El Paso Community College in capturing a series of GigaPan images, in hopes of creating a comprehensive virtual field experience revealing that area’s spectacular geology. Since then, my student Robin Rohrback-Schiavone has been using our GIGAmacro photographic imaging system to make a series of hand-sample GigaPans to accompany the outcrop-scale images that Joshua and I made. The whole …
21 November 2013
West Texas / NOVA field exchange in spring semester
Spring break field course: GOL 295 Regional Field Geology of west Texas: March 8 to 15, 2014, and Appalachian Geology: May 19-24, 2014. West Texas and southern New Mexico showcase tectonic, sedimentary, geomorphic, and volcanic features which provide world-class examples of geologic processes. Students in this course will travel to El Paso, TX, and complete field studies of locations in Carlsbad Caverns, the Rio Grande Rift, the Franklin and Guadalupe …
16 May 2013
GigaPanning Kilbourne Hole
Kilbourne Hole is the crater of a maar volcano in southern New Mexico, just across the state line from El Paso, Texas. I went there the weekend before last with a team from El Paso Community College, led by Joshua Villalobos. This is the place where xenobombs come from! If you go to the right area, you can find dozens of these mantle xenoliths sheathed in fine-grained basalt, like chocolate-coated …
5 April 2013
Friday fold: shale and sandstone from West Texas
No time for more details than that – sorry! Happy Friday and a restful weekend to all!
8 March 2013
Friday fold: Fault propagation fold from Cristo Rey
The Friday fold comes from the Texas – New Mexico – Chihuahua triple point, on the flanks of Cristo Rey mountain.
6 February 2013
Dinosaur footprints in west Texas
Everything’s bigger in Texas, even the footprints…
28 June 2012
Thunderbird rhyolite
Have you ever seen a black rhyolite? Neither had geoblogger Callan Bentley – until he went to the Franklin Mountains of West Texas.
27 June 2012
Permian fusulinids from west Texas
Today, I’m going to show you some monster-sized single-celled organisms: giant fusulinid forams from the western flank of the Franklin Mountains in west Texas, beyond El Paso. I saw these critters in February when I went on a field trip there led by Josh Villalobos of El Paso Community College. Here’s the scene where we found these fossils (view is west towards New Mexico): To prepare you to check out …
10 April 2012
Macro GigaPans of Florissant insect fossils
Today, for your viewing pleasure, please check out five macro GigaPans of insect fossils from the Florissant fossil beds in Colorado (34.07 +/-0.10Ma). These amazing specimens were collected by Joe Cancellare, a student working on research supervised by Josh Villalobos of El Paso Community College in El Paso, Texas. Our M.A.G.I.C. project is helping Joe and Josh out by producing macro GigaPans for them. link link link link link All …
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.