Day 262 : A close-up of one of the cobbles of pegmatitic gabbro from Day 261. The St David's Head intrusion is a layered intrusion, with this cobble originating close to its top. From Porthmelgan, Pembrokeshire.
Day 261 : Back home, and here is a small cairn of pegmatititc gabbro cobbles from the back garden collection. They derive from the St David's Head intrusion but due to weathering on St David's Head itself, the gabbro is not that is not well exposed (See Day 250). However, …
Day 260 : Second day at the British Science Festival in Aston, Birmingham. Aston University, like much of Birmingham, is either brick or concrete and glass. However, the ground floor of the main building is clad with the fossiliferous Portland Limestone.
Day 259 : Away at the British Science Festival in Aston Birmingham and only the second time I've had to resort to my iPhone for Rock365. The problem with Birmingham is that most of the buildings are brick (or modern concrete) so I was struggling a bit. Eventually I found …
Day 258 : This is a quartz feldspar porphyry from the Drumadoon Sill on the west coast of the Isle of Arran, Scotland. Keele collection.
Day 257 : Micaceous Felsite, from the Cheviot Dyke Swarm, Scotchman's Ford, Cheviot Hills, Northumberland, England. Keele Collection.
Day 256 : A porphyritic banded rhyolite from the gorge at Glen Coe, Scotland. Keele collection.
Day 255 : A microgranophyre from Loch Spelve, Mull, Scotland. Keele collection.
Day 254 : A sandstone conglomerate cobble from Freshwater West, Pembrokeshire. Now in my front rockery collection.
Day 253 : A fault breccia in the Carboniferous Limestone at Barafundle Bay, Stackpole, Pembrokeshire.