7 April 2016
New GIGAmacro images of rock samples
Posted by Callan Bentley
Another week, another batch of new images produced on my home-based Magnify2 imaging system from GIGAmacro.
Leptaena brachiopod in (Mississippian?) limestone from Montana:
Link
Here’s the flip side of the same sample, with a lot of fenestrate bryozoans to see:
Link
Fault breccia from the Corona Heights Fault of San Francisco:
Link
Amygdular metabasalt from the western Sierra Nevada of California:
Link
Araucaria mirabilis gymnosperm cone fossil, from the Cerro Cuadrado Petrified Forest site (Mid-Jurassic) of Argentina:
Link
Glacial striations on a pebble from the latest-Devonian Spechty Kopf diamictite, exposed on Corridor H in West Virginia:
Link
As always, enjoy exploring them for details.
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.
In the 1st two photos of the Mississippian Montana limestone, there’s a nice encrusting bryozoan (like Fistulipora) at the bottom of Photo No. 1. On the shot of the other side in the 2nd photo, besides the fenestrate bryozoans, there are some branching, Cystodictya-type bryozoan fronds, on the right side. Plus, on this side there might be an ostracode, perhaps trilobite debris (both sides), and a crinoid columnal. Sorry, but it’s been awhile since I got to play in a Mississippian “garden” again. Miss those critters, and their pals.