A baked horizon in the Columbia River flood basalts
How did this bold orange layer develop? It’s seen in an outcrop near Wilson Creek, Washington, in the Columbia River basalts.
How did this bold orange layer develop? It’s seen in an outcrop near Wilson Creek, Washington, in the Columbia River basalts.
Here are a few new images I’ve been working on with my home-based Magnify2 imaging system from GIGAmacro. Archean basement complex gneiss from the Gallatin Range of Montana: [gigapan id=”185543″] Link (If this looks familiar, that’s because one of the samples I imaged with the Photoscan 3D modeling technique and published on Sketchfab the week … Read more
Pahoehoe “ropes” on a basalt, sample site unknown: Archean gneiss from the Gallatin Range of Montana: Tafoni in Malmesbury Group turbidites, South Africa:
Here are two views of a single anorthosite cobble, collected in the Adirondack Mountains of upstate New York: Raw, natural surface: [gigapan id=”185220″] Link Slabbed and polished surface: [gigapan id=”185217″] Link As you zoom in and explore these GIGAmacro images, see if you can find the delicate little “necklaces” (reaction rims) of garnet wrapping around … Read more
Happy Friday – it’s the end of a very busy week for me, and I hope you too are looking forward to a fun and rejuvenating weekend. Here’s your Friday fold – like last week, a guest submission from Joe Kopera: Wowzers; that’s a looker! What are we looking at here? Joe writes: This photo … Read more
My friend Sarah Penniston-Dorland, of the University of Maryland, supplied this week’s Friday fold. it comes from Catalina Island, California, where Sarah just wrapped up some field work with two of her students. All three of them have given me permission to post the images here: The Catalina Schist is a suite of subduction-related metamorphic … Read more
Today’s Friday fold comes from Martin Schmidt, who has shared a few previous folds with Mountain Beltway readers. It shows a folded ptygmatic vein from the Himalayas. Pretty sweet, amiright? Thanks, Martin. Happy Friday, all!
South of the Golden Gate Bridge in San Francisco, there are beachside exposures of serpentinite mélange: tectonically sheared-out former oceanic crust accreted to western North America as part of an accretionary wedge.
Another one from Samuele Jæger Papeschi: NE verging recumbent F2 folds in Paleozoic phyllites – Filladi di Buti fm., Punta Bianca, N. Apennines, Italy
Anotehr one from Samuele Jæger Papeschi: Recumbent SW verging folds in alternating metalimestones and phyllites in the Metacalcari e Filladi formation, seen at Anisian, Punta Bianca, La Spezia, N. Apennines, Italy