#FridayFold! Punta das Cabras, Galicia (Western Asturian-Leonese Zone of the Variscan orogen), where one can find many striking examples of high-strain folding within shear zones. Recumbent to sheath fold in quartzites & micaschists in the basal part of the Cándana Gp. (Lower Cambrian) #geology ⚒️🧪

#FoldFriday or is it #FridayFold ? Anyway , freshly bathed in this morning's early light, here's a lovely wee fold in kyanite-grade Moine schists above Loch Assapol in Mull. Fingertip at left for scale. 😊🥰 #Geology #Mull #Metamorphic

#FridayFold An old picture of a limpet enjoying some beautiful folded greenschist-facies pelite in a rock pool near Thundergay, on the west coast of Arran. The pale bands are rich in fine-grained muscovite; the dark bands also have chlorite. The few rusty spots mark the position of pyrite crystals.

#Geology #Deformation #Folding #Metamorphic #Dalradian #Arran

What day is today...? Time for #FridayFold In #Asturias (NW Spain), once part of the mighty Variscan orogen. A nice example of tightly folded Devonian turbiditic deposits. Cap lens for scale. Medium size geologist for scale. #geology #structuralgeology #science ⚒️🧪

We like fold-and-thrust belts, don't we? The Papuan Fold Belt, in Papua New Guinea, seen on Sentinel-1 radar data (18/2/2025), where the Darai Plateau is intersected by Mt. Bosavi. To the NE, the Strongly-Folded Belt, and the Imbricate Belt. #Geology #FridayFold #FoldFriday #RemoteSensing ⚒️🧪

Folded Ketchepedrakee Amphibolite in east central Alabama. Nearby, magnetite quartzite is found that is thought to be the metamorphosed material deposited by deep sea hydrothermal vents. We call this kind of distinctive highly weathered amphibolite 'brickbat'.

#FridayFold #Geology #FridayFieldPhoto

#FridayFold This is a fold in Carboniferous rocks at the Pastoratsberg in Essen, Germany. If you're lucky, it's not hidden by parked cars or overgrown in summer. ⚒️🧪

Trinity, Vestal, and Arrow Peaks in the San Juans of Colorado. A #FridayFold cut different ways yields very different routes on the three peaks.

For #FridayFold : twisted flysch by the islet bridge, from our recent visit to #Gaztelugatxe

#FoldFriday

Mount Girourard from Mount Charles Stewart, an unusual #FridayFold in the Canadian Rockies near Banff.

Mount Birdwood, in the Kananaskis region of the Canadian Rockies, land of the #FridayFold .

A #FridayFold from the west coast of the #IsleofLewis.

The dark mafic #OuterHebrides dykes were intruded into the #Lewisian gneiss. The original cross cutting relationship has been brought into near concordance during subsequent #Laxfordian deformation which also generated these folds.

#FridayFold in #Archaean amphibolites seen on the west coast of the #IsleofLewis.

#FridayFold seen in a new road cutting near Stornoway.

#Archaean Lewisian gneiss is cut by mafic #OuterHebrides dyke. Both are then folded during the #Laxfordian.

Cross cutting of the gneissic foliation can be seen in the core of the fold, whilst the limbs are concordant.

Il n'y a pas que les roches sédimentaires ou métamorphiques qui présentent des plis, les roches magmatiques aussi ! Exemple avec ce pli dans la coulée de lave de Pietre Cotte (Vulcano, #Italie), mis en évidence par l'alternance de bandes de rhyolite (claires) et d'obsidienne (sombre).
#FridayFold #géologie

View from the south to the Vercors plateau, Drôme, France. In the middle ground you can see the curved 'barre tithonique' (solid limestone of Upper Jurassic age). Behind that is the Lower Cretaceous limestone of the Glandasse (2041 m), which forms the edge of the Vercors plateau. #geology #fridayfold #foldfriday #france #alps

#fridayfold variscan folding in sst.shale series #portugese zone #geology #rocks

Tight to isoclinal #FridayFold in an Archaean layered intrusion at Cnoca Breac, on the west coast of South Uist.
Considered to be some of the oldest rocks in the Outer Hebrides at > 2900 Ma the compositional layering is still distinguishable despite strong Laxfordian reworking

#FridayFold in mylonitic Lewisian gneiss.

North-west coast of the #IsleofLewis

Look at this folded quartz vein, changing amplitude and frequency with decreasing thickness 😀 #FridayFold on #SilentSunday #geology #fieldwork #portugal