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7 September 2011
Graded bed from the Billy Goat Trail
Spotted this one Monday on the newly-rerouted section of the Billy Goat Trail’s Loop A, in Chesapeake and Ohio Canal National Historical Park. This graded bed was deposited as a turbidite in the Iapetus Ocean, sometime in the time-frame of 700 to 460 million years ago. It was metamorphosed 460 Ma during the late Ordovician Taconian Orogeny, and that’s probably when the little quartz veins formed, too. Click on it …
6 September 2011
Callan gets friendly with dinosaur
At the Sheridan College natural history museum, this past summer.
Two more macrobugs
It’s that kind of day. Grasshopper? Cricket? Katydid? Some kind of orthopteran, anyhow. Not a full adult, to judge by the lack of well-formed wings. And, here’s a yellow crab spider:
Macrobug: Unidentified caterpillar – UPDATED
Some kind of caterpillar I spotted on the Billy Goat Trail yesterday – can’t find a perfect match for it to identify the species. Anyone know? Chime in. UPDATE – My colleague Victor Zabielski pinned it as Schizura concinna, the redhumped caterpillar. Thanks, Victor!
2 September 2011
Friday fold: duplex structure in the gastropod limestone
The Friday fold is a gorgeously deformed “duplex structure” in Mesozoic limestones of southwestern Montana.
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.