The Foreknobs Formation is a Devonian unit in the Valley & Ridge province of the Mid-Atlantic Region. It was deposited in relatively shallow near-shore conditions during the Acadian Orogeny.
On a field trip to Corridor H, a new highway transecting the West Virginian Valley & Ridge province on Monday, I stopped to document a couple of beds showing very nice ripple marks.
These ones are symmetrical, and thus likely represent oscillating waves:
Here, two wave sets interfere with one another, amplifying and cancelling out each other’s bedforms:
Here’s a GigaPan of the scene:
Link 0.44 Gpx GigaPan by Callan Bentley
And here’s a 3D model: