Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Folded metamorphic rock in Kings Canyon National Park, California, USA

Folded metamorphic rock in Kings Canyon National Park, California, USA

Parsley fern (Cryptogramma crispa) growing amongst slate, Aberfoyle, Scotland, UK

Slate quarries in Elterwater in the Langdale Valley, Lake District, Cumbria, England, United Kingdom, Europe

Inclusion marks on a boulder above the Langdale Valley in the Lake District, Cumbria, England, United Kingdom, Europe

Light-coloured ortho gneiss, metamorphic rock, which has been deeply cut by the Verzasca River near Lavertezzo, Valle Verzasca, Ticino, Switzerland, Europe

Monoliths prepared in gneiss Lewis, erected about 2000 years BC.