Transect Trip 13: a better plume!
Okay… That last plumose structure was nothing compared to this beauty…
Okay… That last plumose structure was nothing compared to this beauty…
Spectacular plumose structure on rusty joint surface Weverton Formation:
Bedding and cleavage intersect in the Weverton Fm. Bedding = Cambrian Cleavage = late Paleozoic (Alleghanian)
Gorgeous back-rotated quartz-filled tension gashes in the Antietam Fm. Sinistral sense of shear:
Side view of Skolithos tubes:
Looking down on Skolithos ichnofossils in the Antietam Fm. quartz sandstone:
A few rip-up clasts in arkosic matrix (Swift Run Fm.):
Live geoblogging continues… Here’s some nice round quartz pebbles in the Swift Run Fm:
Neoproterozoic arkose and mudstone above the basement complex:
Multiple anastomosing high strain zones cut through the Blue Ridge basement complex during Paleozoic mountain-building. Ar/Ar cooling ages on muscovite here are 320-340 Ma.