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16 August 2013
Friday fold: Sandy Hollow, Montana
Today, a view to the southwest, from close to the hinge of the main anticline in the Sandy Hollow area, a classic geological field mapping locality in southern Montana: Triassic-aged Dinwoody Formation dominates the main part of the scene. Note how the strike and dip of the positively-weathering strata wrap around. Our Rockies students mapped here this past July, trodding on hallowed ground familiar to generations of field camp students.
15 August 2013
Disconformity in northern Colorado
Have a look at this lovely (almost glowing) example of a disconformity between Coloradan limestone and overlying sandstone.
13 August 2013
Absaroka volcanic breccia
A lovely example of a volcanic breccia (from the Eocene Absaroka Volcanics of southern Montana) is showcased, in two different photographs.
12 August 2013
Monday macrobug: Huge honkin’ horsefly
Horseflies have such lovely eyes… …but man, they sure can open up a welt.
9 August 2013
Friday fold: four more Proterozoic folds from the Laramie Range
To this and this, add these: Some interesting fold shapes here. Bob Bauer, who took me to this site, interprets these as interference patterns, evidence of two generations of folding: Happy Friday – for me, there’s only a week of summer break left, and then a week from today, I’ll be back at work.
2 August 2013
Friday fold: 2Z
Two Z folds from the Proterozoic rocks of the Laramie Range, Wyoming – you get two since I’ve been so delinquent about blogging over the past month.
1 August 2013
New Rockies GigaPannery
Several new GigaPans I’ve produced over the past few weeks in the Rocky Mountains of Montana and Wyoming: link link link link link link link link
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.