Friday fold: the Ross Sandstone
The Friday fold is an exposure of the Ross Sandstone in Ireland, bent into a syncline that dives below water.
Friday Fold
Friday fold: the folded xenoliths of Duck Creek
On Duck Creek (Ellendale, NC quadrangle), you can see folded xenoliths within the Toluca Granite (383 Ma, 378 Ma, or 368 Ma, depending on which mineral you ask). The granite there contains xenoliths that contain pre-exisiting fabrics and structures, and we stopped at Duck Creek on the pre-GSA-Charlotte field trip I took to the Neoacadian … Read more
Friday fold: Pakistani Perplexity
In last week’s Friday fold, I featured this image… …which prompted commenter Lynn David to ask, What’s going on to the west side of that red/green rock cored syncline in #2? It looks like some sort of disconformity but then I looked closer (and man, does that rock redden up) and it appears that the … Read more
Friday folds: Google Earth screenshots
Found these lovely places over the past few weeks while searching (unsuccessfully) for Where On (Google) Earth? scenes… Click on any of them to make them bigger.
Friday fold: Chert chunk
Picked this one up the summer before last and took its portrait without recording too much else about it. There’s a small fault in there towards the bottom too. Sorry I forgot to mention it. My fault… Happy Friday! A light rock for “black Friday,” eh? Hope you had a happy Thanksgiving.
Friday fold: Neoacadian Inner Piedmont trip, part IV: Migmatitic metagraywacke
The Friday fold comes from a stop on the “Neoacadian Inner Piedmont” field trip that Callan attended prior to the GSA meeting in Charlotte, North Carolina, last week.
Friday fold: Boomer Falls
The Friday fold is seen at one of the stops on Callan’s pre-GSA-Charlotte field trip: a small waterfall in North Carolina’s Inner Piedmont.
Friday fold: dinner plate
The Friday fold appears on a flat slab along Maryland’s Billy Goat Trail.
Friday fold: South African gneiss
Another Friday, another fold. …By another Bentley!
Friday fold: Pofadder shear zone mylonites in 3D
Christie Rowe sent me these two images. They were taken by Ben Melosh and Louis Smit. The folded layers are mylonites of the Pofadder Shear Zone in South Africa. I love it when folds are expressed not only in profile, but also in three dimensions. Nothing in life could possibly be better. We’ve featured the … Read more