Fold mystery – UPDATED

What can you tell me about this new fold sample I recently acquired? Width of sample is 12.5 cm. The face you’re looking at was cut but not polished. Here’s a close up: With layering annotated, to highlight the disharmonic nature of these folds: Anyone have any guesses what’s going on here? ——————– UPDATE —————— … Read more

Geology and wine in northern Virginia, part II: the Valley & Ridge

Callan attends the Geological Society of Washington’s fall field trip, examining the relationship between grape-growing and the underlying geology of two provinces in northern Virginia: the Blue Ridge and the Valley & Ridge. With GSW compatriots, Callan visited Hume Vineyards in the central Blue Ridge province and North Mountain Vineyard and Winery in the Shenandoah Valley. This is part II of the field trip report.

Geology and wine in northern Virginia, part I: the Blue Ridge

Callan attends the Geological Society of Washington’s fall field trip, examining the relationship between grape-growing and the underlying geology of two provinces in northern Virginia: the Blue Ridge and the Valley & Ridge. With GSW compatriots, Callan visits Hume Vineyards in the Blue Ridge basement complex and North Mountain Winery in the Shenandoah Valley. This is part I.

Convection in a dirty dish

Saw this in a greasy / soapy baking pan in my kitchen sink the other day: Do you see those lobe-shaped light areas, separated by dark septae? I think that’s the semi-gelled signature of gravitational instability, perhaps thermally driven. I’m speaking of convection: upwelling in the round light areas, and sinking of denser material in … Read more

The Omnivore’s Dilemma, by Michael Pollan

In the delivery room last week, while we waited for Lily’s labor to ramp up, I finished reading The Omnivore’s Dilemma, by Michael Pollan. I think it was one of the most insightful, important books I’ve ever read. I was pre-disposed to like it, because I really enjoyed Pollan’s earlier book The Botany of Desire, … Read more

Tofu with hackle fringe

We were making dinner last week and took out a block of “silken” tofu* with less care than we should have, and it broke. But what a break! The fracture showed a gorgeous elliptical joint face that broken up into a twisted series of hackles along its fringe: That’s something nice homogeneous fine-grained rocks do, … Read more

Buzzard Rock

Took a hike this morning with my bride-to-be, out to Buzzard Rock on the northeastern corner of Massanutten Mountain. There, we observed numerous boulders of Massanutten Sandstone float, many bearing charismatic cross-beds. Here’s one more slab of float, presumably weathered out along the main bed, showing gorgeous internal cross-stratification: A closer look at the left … Read more