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Late Triassic petrified wood and Chinle Formation (clay and sandstone). Petrified Forest National Park, USA Colourful plants and layered rocks. Norway Colourful plants and layered rocks. Norway Layered rocks and autumnal plants. Norway Layered rocks and autumnal plants. Norway Layered rocks in Norway. Norway Layered rocks in Norway. Norway Layered rocks in Norway. Norway Layered rocks in Norway. Norway Slate rocks. Norway Layered rocks in Norway. Norway Layered rocks in Norway. Norway Layered rocks in Norway. Norway Layered rocks. Norway Kuiseb River. Namibia Meanders of the San Juan River, cut into the strata of Pennsylvanian Hermosa Formation (Late Carboniferous Period). Utah, USA The Pancake Rocks panorama. New Zealand Eroded sandstone rocks. Utah, USA Sandstone rocks at Zion. Climbers dwarfed by sandstone cliffs at Zion Canyon. Utah, USA Fish River canyon, Namibia 1995. Fish River canyon, Namibia 1995. Tuff - layers of volcanic ash. Deception Island, Antarctica River-worn rocks. Glen Nevis, Scotland Eroded Chinle Formation (late Triassic clay and sandstone). Petrified Forest National Park, USA Basalt rocks, laid down by multiple volcanic eruptions. Iceland Panoramic view of the Grand Canyon. Arizona, USA Eroded mud. Petrified Forest National Park, USA