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28 October 2013
GSA – Halfway through the annual meeting
These annual meetings of the Geological Society of America seem to fly by faster and faster. I’ve found that, through the years and as my career has developed, that I have less and less time for attending talks or contemplating research presented on posters. Instead, I spend my time sharing my own work, supporting students, networking and catching up with colleagues, and attending meetings for various groups and projects. Less …
26 October 2013
Off to GSA
This morning I’m on a flight to Denver, for the 125th anniversary annual meeting of the Geological Society of America. The annual GSA meeting is a special time of year for me, and for many geology professionals across the country. It’s an intense half-week of talks, sharing, learning, networking, hanging out with old friends, meeting new friends, getting inspired, and hopefully inspiring others. It’s a time to mentor our best …
26 April 2013
Friday folds: Simple shear and the unfolding of folds
The Friday fold combines a moment of insight on a field trip in the Archean Superior Province and a new paper published this month in the journal GEOLOGY.
25 April 2013
Deformation in the Lake Vermillion Formation
Today, let’s go back to the Pike Dam, where we spent some lovely moments last week, agog at the lovely graded beds and flame structures visible there. In contrast, today we want to examine the deformational structures seen elsewhere at this same outcrop. There are folds and faults and joints and more exotic fare: tension gashes and Riedel shears. The deformation here is the youngest to affect the Vermillion District …
10 April 2013
Primary structures in the Lake Vermilion Formation
Callan showcases some extraordinary depositional structures (graded bedding and flame structures) seen in Archean turbidites in the Superior province of northern Minnesota.
20 November 2012
Digital images of the “Digital Geology Speed Dating” session at GSA
Justin Samuel at GSA sent me these images from the annual meeting in Charlotte. They show me demonstrating GigaPan technology at the Pardee Symposium called “Digital Geology Speed Dating”. With my colleagues Ron Schott and Jen Piatek, I suggested that GigaPans are a cool medium with readily obvious geologic usage for research, outreach, and education. I’m grateful to the session’s organizers, Declan De Paor, Steve Whitmeyer, and John Bailey, for …
16 November 2012
Friday fold: Neoacadian Inner Piedmont trip, part IV: Migmatitic metagraywacke
The Friday fold comes from a stop on the “Neoacadian Inner Piedmont” field trip that Callan attended prior to the GSA meeting in Charlotte, North Carolina, last week.
13 November 2012
Neoacadian Inner Piedmont trip, part II: more Walker Top
Today, I’ve got a batch of additional photos of the Walker Top Granite to share, variably mylonitized (sheared out under ductile conditions)… Nice garnets in some spots: Delta porphyroclast: Lovely sheared-out rocks…
9 November 2012
Friday fold: Boomer Falls
The Friday fold is seen at one of the stops on Callan’s pre-GSA-Charlotte field trip: a small waterfall in North Carolina’s Inner Piedmont.
3 July 2012
Granite dikes that have been folded and boudinaged
It seems like a good morning to return to Ontario, and to the Archean shear zones exposed at the Quetico/Wabigoon subprovince boundary of the Superior Craton. Readers will hopefully recall that I spent several days absorbing structural goodness from these rocks on a field trip before the Minneapolis GSA meeting last fall. The trip was led by Basil Tikoff, Bob Bauer, Dyanna Czeck, and Peter Hudleston. Our final Canadian stop …
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.