17 April 2015

Fault breccia in Beekmantown limestone

Posted by Callan Bentley

Here’s another sight at the Eocene dikes site in Bluegrass Valley, Virginia, mentioned yesterday:


That’s a gorgeous fault breccia, emplaced parallel to bedding, and parallel to the felsic dike (which can be found a few feet to the west / right of these photos):


It was very poorly lithified, shockingly crumbly to the touch, considering the big slab of rock downhill (to the right) of it.

Here’s a link to the site on Google Maps if you want to visit it yourself.