Graham Eaton / An anticlinal fold in Carboniferous age sandstone and shales. This fold and deformation was formed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by...

Graham Eaton / Steeply dipping beds of Carboniferous age sandstone and shales (Culm measures) on the flank of a large fold. This deformation was formed by compression during the Variscan or Hercynian orogeny, a geol...

Graham Eaton / An anticlinal fold in Carboniferous age sandstone and shales. This angular anticline is a kink fold with a defined fracture along the fold axis. These rocks were folded and faulted during the Variscan...