Uniformitarian
Heat-stressed map of the Chesapeake Bay / Washington, DC region, as seen at Kenilworth Aquatic Gardens. Looks like mudcracks, eh? Similar stresses; similar strains.
virginia
Straight nautiloid fossil
It seems I forgot to show this fossil when I found it in February of last year with my MSSE advisor John Graves. We were out in the Needmore Formation of the Fort Valley then. The Needmore is a formation I visited again yesterday with some colleagues in other outcrops further to the west. In … Read more
Falls of the James III: river work
In today’s post, I’ll finish up with my geologic discussion of the falls of the James River in Richmond Virginia, south of Belle Isle. Previously, we’ve examined the bedrock at this location (the Petersburg Granite) and a series of fractures – some faults and some extensional joints – that deform that granite. Now we come … Read more
Falls of the James II: fractures
In my previous post, I introduced you to the Petersburg Granite, as it is exposed south of Belle Isle, at the falls of the James River in Richmond, Virginia. I mentioned that it was fractured, and I’d like to take a closer look at those fractures today. The geologically-imparted fractures were exploited by human granite … Read more
Falls of the James I: pluton emplacement
Last Friday, NOVA colleague Victor Zabielski and I traveled down to Richmond, Virginia, to meet up with Chuck Bailey of the College of William & Mary, and do a little field work on the rocks exposed by the James River. Our destination was Belle Isle, a whaleback-shaped island where granite has been quarried for dimension … Read more
"Geology of Skyline Drive" w/JMU
I mentioned going out in the field last Thursday with Liz Johnson‘s “Geology of Skyline Drive” lab course at James Madison University. We started the trip south of Elkton, Virginia, at an exposure where Liz had the students collect hand samples and sketch their key features. Here’s one that I picked up: Regular readers will … Read more
Stonefly
This weekend I went camping with my family in Virginia’s Shenandoah Valley, near Berryville. I poked around with river cobbles and experienced fluvial dynamics firsthand with an inner tube ride down the Shenandoah River, but mainly I turned off the geology part of my brain. Instead, the brain enjoyed idling, and thinking about how to … Read more
Gorgeous poison ivy
Spent the day in the field yesterday with Liz Johnson of James Madison University and her fun group of students in a “Geology of Skyline Drive” summer course. More on the geology later… For now, I just wanted to toss a group of photos of poison ivy up here. Look at this beautiful plant! Look, … Read more
"Those aren't pillows!"
In the 1987 comedy Planes, Trains, and Automobiles, John Candy and Steve Martin have a funny experience. It involves a cozy hotel room (one bed only) and the two travelers are huddled up for warmth. As he wakes up, John Candy thinks he is warming his hand “between two pillows.” At hearing this, Steve Martin’s … Read more
3 bugs + 1 lizard
Yesterday, Lily and I embraced my first day of no-more-classes by taking a hike. We drove out to Massanutten Mountain and hiked up to Signal Knob, a ten-mile (roundtrip) jaunt with about 1500 feet of elevation gain. Along the way, we saw a lot of Massanutten Formation quartz sandstone (Silurian), a few trace fossils, a … Read more