Transect Trip 9: Skolithos B

Side view of Skolithos tubes:

Transect Trip 8: Skolithos A

Looking down on Skolithos ichnofossils in the Antietam Fm. quartz sandstone:

Transect Trip 7: mudchips

A few rip-up clasts in arkosic matrix (Swift Run Fm.):

Transect Trip 6: coarser Swift Run

Live geoblogging continues… Here’s some nice round quartz pebbles in the Swift Run Fm:

Transect Trip 5: bedding in the Swift Run

Neoproterozoic arkose and mudstone above the basement complex:

Transect Trip 4: Protomylonite

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.

Transect Trip 3: Fresh charnockite

Charnockites are orthopyroxene-bearing granitoids, common in the core of the Blue Ridge Anticlinorium:

Transect Trip 2: charnockite boulders

With a distinctive orange weathering rind:

Transect Trip 1: map talk

Live geoblogging my post-NE/SE GSA field trip: Bill Burton and Chuck Bailey prep the group with a discussion of map patterns in the Blue Ridge…

Update

Just got back from three days of geology conferencing at the Northeastern & Southeastern Joint Section Meeting of the Geological Society of America in Baltimore. No time to blog whilst there, though I shot a dozen or so tweets up to my Twitter feed: small beer compared to a nice meaty blog post. Apologies if it was insufficient for your needs. Great to meet up with everyone there… I’m off tonight for a two-day field trip in the Appalachians, and I’ll get back to blogging this weekend when I return.