Pyrrhotite with Calcite from Russia by Dan Weinrich
Looks like the Portsmouth Uni lot have just been on fieldwork!
This is practically the most famous geological site in Dorset (if you don’t count the fucking Jurassic Coast).Lulworth FTW.
Richat Structure
Also known as the Eye of the Sahara and Guelb er Richat, is a prominent circular feature in the Sahara desert of west–central Mauritania near Ouadane. This structure is a deeply eroded, slightly elliptical, 40-km in diameter, dome. The sedimentary rock exposed in this dome range in age from Late Proterozoic within the center of the dome to Ordovician sandstone around its edges. The sedimentary rocks comprising this structure dip outward at 10°-20°. Differential erosion of resistant layers of quartzite has created high-relief circular cuestas. Its center consists of asiliceous breccia covering an area that is at least 3 km in diameter.
Cuanta belleza.













