Gypsum veins in Upper Triassic mudstone, Watchet, N Somerset
Wind blown basalt sand lightly dusting a glacier, Vatnajokull, Iceland
Lava tunnel near Reyjkavik, Iceland
Soil horizons between lava flows above Litlanesfoss, Iceland
Triassic sandstone, St Bees Head, Cumbria
Geothermal power, Myvatn, N Iceland
Normal faults, near Madrid, 1980s
Dykes, Finnmark, N Norway, 1982
Patapampa Pass (4910m), Peru
Tufa towers, Mono Lake, California
Tufa towers, Mono Lake, California
Half Dome, Yosemite
British Gas colleagues fondly remembered, Lilstock, N Somerset
Lower Jurassic Blue Lias Group faulted against red Mercia Mudstone Group, Blue Anchor Fault, Blue Anchor Bay, N Somerset
Unknown volcano from Colca Canyon, Peru
Recumbent isoclinal fold in Late Carboniferous sandstones and mudstones, Crackington Haven, Cornwall
Serpentinite, Kynance Cove, Lizard, Cornwall
Flamborough Head, East Riding of Yorkshire
Fracture propagation shockwaves 'frozen' into the rock, Entrada Sandstone Formation, Arches National Park, Utah
Fracture propagation shockwaves 'frozen' into the rock, Entrada Sandstone Formation, Arches National Park, Utah
Entrada Sandstone Formation, Arches National Park, Utah
Recumbent isoclinal fold in Late Carboniferous sandstones and mudstones, Millook Haven, Cornwall
Ancient landslide, S Iceland