Shale, close up
Shale
Sample of shale
A piece of black shale, close-up
Shale specimen
Red Shale
Shale, California, USA
Shale, close-up
Shale with fossilized ripple marks
Retiolites fossil on shale
Fossiliferous Limey Shale, New York, USA
Coastal shale platform
Fossil Starfish preserved in Shale
Mudstone
Limestone cobbles on shale
Pyrite crystals on Shale
Sea stack, Wales
Quartz and schist outcrops
Boulder clay
Clay Soil
Greywacke
Rock strata
Limestone rock, close up
Lump of coal, close up
Limestone and shale strata
Red sandstone
Green marl
Welsh slate, close up
Unrefined piece of jet
Calcareous mudstone
Anthracite
Sandstone
Variety of Sedimentary Rocks
Sandstone, Utah, USA
Sample of sandstone
Ammonite fossils
Disintegrated Granite
Goniatites crenistria fossilised in shale
Mudstone containing fossils, illustration
Samples of sandstone
Slate outcrop, France
Flint
Sedimentary discordance
Chert, a type of sedimentary rock
A piece of natural slate
Limestone specimen
Arkose, a sedimentary rock
Yellow Sandstone
Variety of Metamorphic Rocks
Sedimentary Rocks
Arkose, a sedimentary rock, Massachusetts
Slate, Brattleboro, Vermont, USA
Septarian nodule
Clay Concretion, Massachusetts, USA
Clay, Gay Head, Martha's Vineyard
Clay Concretion, Vermont, USA
Montmorillonite crystals in bentonite
Illite
Green nontronite
Blackchurch Rock in Crackington Formation
Cambrian Trilobite
Sand
Loam Soil
Peat
Glass bottle of shale oil
Feldspathic gritstone
Blocks of oil shale (marlstone)
Rock types
Lignite
Covellite in clay groundmass, close-up
Banded flint
Close up of a pattern in Sandstone, Utah
Soil samples
Bunter sandstone
Flute marks on mudstone
Concretion of sand and iron on Dinosaur Ridge, Colorado, USA
Slate roofing
Folds of calcite in limestone rock
Energy
Pile of coal
Kesselspitze, Radstatt Alps, Austria
Coastal cliffs, Wales
Iron pyrite crystal, SEM
Hoodoos in shale
Sepiolite clay mineral
Iron pyrite crystals, SEM
Specimen of calcite crystal mined in Cumbria
Dolomite
Celestine I
Pagiophyllum conifer leaf fossils
Gogotte fossilised sandstone concretion, close-up
Cryoturbation in soil lacquer profile
Pink orthoquartzite
Sandstone rock formation, South Africa
Gypsum rock
Sedimentary rock concretion
Cross-bedding in sandstone rock
Cliffs at Handa Island, Scotland, UK
Sedimentary rocks
Ancient sand and shell layers
Karst erosion in the Italian Apennines
Sample of gneiss
Rock formation, Segelsallskarpet, Greenland
Fossil stromatolites, cross-section
Halloysite
Clay
Near metallic lustre of anthracite rock
Stalactite
Sandstone specimen
Lignite Coal specimen
Flint and Chalk, Dover, England
Cannel Coal, Kentucky, USA
Bituminous Coal, Pittsburgh, Pennsylvania
Anthracite Coal, Pennsylvania, USA
Slate
Lignite, Brandon, Vermont, USA
Coal Essex Junction, Vermont, USA
Heap of ground coal
Sample of limestone
Cubic zirconia
Calcite in mudstone
Flint stone
Coral limestone
Spriggina fossil
Quartz filled concretion
Quartz seam in schist
Conical hill
Glass bottle of biohydrogen
Trimerocephalus trilobite fossil
Amethyst
Sample of chalk
Septarian nodule polished stone
background of coal
Grey orthoquartzite
Gypsum
Hoodoo, Alberta Badlands
Onychiopsis fern fossilised in siltstone
Magnification of grain of sandstone rock
Black and red banded Ironstone
Septarian concretion in claystone
Jet (lignite) rough
Sample of coal
Mawsonite in sandstone
Bentonite
Kata Tjuta National Park, Northern Territory, Australia
Ammonite in front of Lias cliffs
Shark's tooth fossil
Titanium deposits on a beach
Slate showing stratum lines, full frame
Ganister, polarised light micrograph
Nummulitic limestone, LM
Nummulitic Limestone, LM
Shelly limestone, polarised LM
Polarised LM of thin section of greywacke