#FridayFold #DogWalkingGeology A pic taken eight years ago featuring a youthful Spud on the fabulously folded high-grade metasediments at Am Muidhe, Glenfinnan.

#DogWalkingGeology Spud is admiring this lovely shingle-polished outcrop of Moine schist on the beach at Ardalanish, Mull. #Metamorphic #Mull

#DogWalkingGeology Spud seems strangely uninterested in this nice quartz-vein showing sinistral offsets (movement to the left of the viewer) on Ardalanish beach this morning. These outcrops are normally buried under sand/shingle, but were looking good today.
#Mull #Geology #Sinistral

#DogWalkingGeology A #LifeGoal achieved 🎆🕺🎉💃 Kyanite gneisses occur in the Mull Moine rocks, but I have *never* found a beach pebble of these rocks, despite searching intensely, until THIS MORNING. A very tasty cobble 😋 #Geology #Metamorphic #Mull

#DogWalkingGeology Some mysterious round colonies of marine algae and some limpets all enjoying their solid substrate of Moine garnet-amphibolite at Ardalanish this morning. 😊 #Mull #Geology #Gastropods

#DogWalkingGeology a superb example of a retrogressive reaction front from this morning's walk with Spud at Uisken. To the top+right is garnet amphibolite preserving clean high temperature (about 650-700 oC) metamorphic minerals. The paler green grey rock at bottom+left has formed by later hydration of the amphibolilte at 350-400 oC. The boundary between fresh high grade rock + completely altered low-grade rock is sharp over a distance of a few cm. #Geology #Metamorphism #Retrogression #Mull

#DogWalkingGeology Spud out enjoying some iron oxyhydroxide (bio-?)films on this peaty water, plus very vibrant yellow spearwort flowers. #Mull #Glaislean #Spearwort #biogeochemistry

This morning's #DogWalkingGeology The Camas Tuath (North Bay) quarry, in the Ross of Mull Granite, opened by Alan Stevenson, for the Northern Lighthouse Board, to provide granite for Skerryvore Lighthouse in 1839. It was worked until around 1857, and also provided stone for Ardnamurchan lighthouse, as well as ornamental stone. Sad that none of this beautiful stone is worked today ☹️ #Geology #LocalStone #Lighthouse #Mull

#DogWalkingGeology Another loose rock from Ardalanish beach in SW Mull from this morning. This is a really distinctive rock, from the andesitic sills forming the lower part of the Glencoe volcanic sequence, 85km to the NE. Transported by glaciers. The purple alteration is partly hematite, but also distinctive pink manganese-rich epidote , which you can see in the core of the pale patch on the left of the cobble. #Geology #Mull #Glencoe