‘Gneiss’ Rocks
A succession of mudstones, siltstones and sandstones belonging to the Stainmore Formation near to Howick, Northumberland. This Namurian sequence is also known as the Yoredale Group, and is famous for its cyclic sedimentary facies.
From Jonathan Wilkins, X-ray Mineral Services Ltd
Share your ‘Gneiss’ Rocks
Email rosy@pesgb.org.uk with your photos