Graham Eaton / The Norber Erratics. Blocks of older Silurian sandstone, perched on top of younger Carboniferous limestone, that were left by retreating ice at the end of the last Ice Age, Clapham, Yorkshire, winter

Graham Eaton / Limestone pavement above Malham Cove, Yorkshire

Graham Eaton / Hawthorn (Crataegus monogyna) tree growing out of joints in carboniferous limestone, Ingleton, Yorkshire, January 2017. The tree has exploited a water enlarged joint or gryke in the limestone pavement...

Graham Eaton / The Green Bridge of Wales, a natural rock arch comprising Carboniferous limestone, Castlemartin, Pembrokeshire, Wales. September 2017.

Graham Eaton / The Green Bridge of Wales, a natural rock arch comprising Carboniferous limestone, Castlemartin, Pembrokeshire, Wales. September 2017.

Graham Eaton / Conglomerate at the unconformity between the Carboniferous limestone below and the Triassic sandstone above at Sully, near Cardiff, South Glamorgan, Wales, UK. September.

Graham Eaton / The Carboniferous age Limestone escaprpment of Warrendale Knotts near Settle, North Yorkshire, UK, October

Graham Eaton / A glacial erratic of Silurian age sandstone, perched upon younger Carboniferous age limestones. The limestone forms a limestone pavement with the hill , Whernside, Yorkshire, England, UK.

Graham Eaton / Glacial erratic of Silurian age sandstone, perched upon youger Carboniferous age limestones. The limestones form a limestone pavement with the hill Ingleborough in the background. Whernside, Yorkshire...

Graham Eaton / An erratic of Silurian sandstone sitting on Carboniferous limestone at Twistleton Scar above Ingleton, with Ingleborough in the backgrond, October. Whernside, Yorkshire, England, UK.

Graham Eaton / Perched boulder of Carboniferous age Millstone Grit on the western edge of the Kinder Scout plateau. Derbyshire, UK, September

Will Watson / A landslip of the Carboniferous South Wales Lower Coal Measures on Blorenge and surrounding Heather (Calluna vulgaris) and Bilberry (Vaccinium myrtillus) moorland, Monmouthshire, Wales, September 2018...

Will Watson / A natural doline pond with exposed sandstone rocks from the South Wales Lower Coal Measures, Carboniferous Period. Mynd Llangatwg, Brecon Beacons National Park, Breconshire, Wales, November 2018.

Ashley Cooper / Limestone quarry to produce cement. Clitheroe Lancashire, England, UK, March 2009.

Ashley Cooper / Limestone quarry to produce cement. Clitheroe Lancashire, England, UK, March 2009.

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) in plan view, deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic...

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 / Folded Carboniferous age sandstones, Hartland Quay, Devon, UK, May

Graham Eaton / Bowl carved in Carboniferous, Millstone Grit on Stannage Edge, Hathersage, Derbyshire, March. The bowls were carved by a local gamekeeper in the early 1900's as drinking bowls for grouse and dogs.

Graham Eaton / A bowl carved in Carboniferous, Millstone Grit on Stannage Edge, Hathersage, Derbyshire, March. The bowls were carved by a local gamekeeper in the early 1900's as drinking bowls for grouse and dog...

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic continental c...

Graham Eaton / Clints (blocks) and Grykes (gaps) of limestone pavement. This is Carboniferous age limestone, part of a large area of Karst above Austwick, Yorkshire, UK. Slightly acidic rainfall, erodes and enlarges...

Graham Eaton / Conjugate kink bands in Carboniferous turbidite shales, Bude, Cornwall, UK, May

Graham Eaton / An anticline in deformed Carboniferous sandstones and shale (Culm Measures) near Bude, Cornwall, UK, March. These rocks were deformed during the Hercynian or Variscan Orogeny, a mountain building even...

Graham Eaton / Karst landscape in Carboniferous (Dinantian) Limestone, with Clints and Grykes developed on a limestone pavement. Malham, Yorkshire, UK, May

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 / Tilted beds of sandstone and thin shales of the Carboniferous, Culm Measures (Bude Formation) Sandy Mouth near Bude, Cornwall, UK, May. The bed represent cycles of deposition associated with climate c...

Graham Eaton / Tilted beds of Carboniferous age, Culm Measures (Bude Formation) sandstone and shale, Bude, Cornwall, UK, May.

Graham Eaton / A Chevron or Kink fold anticline in Carboniferous age turbidite sediments. Bude, Cornwall, UK, may.

Graham Eaton / Tilted beds of sandstone and thin shales of the Carboniferous, Culm Measures (Bude Formation) Sandy Mouth near Bude, Cornwall, UK, May. The bed represent cycles of deposition associated with climate c...

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) in plan view, deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic...

Graham Eaton / A Glacial Erratic at Norber near Austwick, Yorkshire, UK. This is one of the Norber erratics, where blocks of older Silurian sandstone were left on top of younger Carboniferous limestone by a retreati...

Graham Eaton / A Glacial Erratic at Norber near Austwick, Yorkshire, UK. This is one of the Norber erratics, where blocks of older Silurian sandstone were left on top of younger Carboniferous limestone by a retreati...

Graham Eaton / A Glacial Erratic at Norber near Austwick, Yorkshire, UK. This is one of the Norber erratics, where blocks of older Silurian sandstone were left on top of younger Carboniferous limestone by a retreati...

Graham Eaton / Small extension (normal) faults within a layer of shale between two layers of more competent sandstone. Carboniferous, turbidites, Bude, Cornwall, UK, May.

Graham Eaton / An eye hole eroded into dipping Carboniferous age Sandstones and Shales. Hartland Quay, Devon, UK, May

Graham Eaton / A small fault offsetting Carboniferous limestone that forms the side of a collapse arch. Penmon, Anglesey, Wales, UK, June

Graham Eaton / Chevron recumbent folding in Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late...

Graham Eaton / Recumbent folds in Carboniferous age sandstones and Shale (Bude Formation), Bude, Cornwall, UK, May. The rocks were deformed during the Hercynian Orogeny or mountain building event.

Graham Eaton / Recumbent folds in Carboniferous age sandstones and Shale (Bude Formation), Bude, Cornwall, UK, May. The rocks were deformed during the Hercynian Orogeny or mountain building event.

Graham Eaton / Ripple marks in a bedding plane of Carboniferous age Sandstone, near Bude, Cornwall, UK, March. The ripple marks show that the sandstones were deposited in water.

Graham Eaton / Small Waterfalls at Sandy Mouth beach, near Bude, Cornwall, UK, March. The rocks are steeply dipping Carboniferous age, sandstone and shale (Culm Measures).

Graham Eaton / A small waterfall at Sandy Mouth beach, near Bude, Cornwall, UK, March. The rocks are steeply dipping Carboniferous age, sandstone and shale (Culm Measures).

Graham Eaton / Tilted beds of Carboniferous age, Culm Measures (Bude Formation) Sandy Mouth, near Bude, Cornwall, UK, May

Graham Eaton / Sole marks on the underside of a bed of Carboniferous age, turbidite sandstone. Bude, Cornwall, UK, may. Sole marks are formed by flowing water or currents and can indicate the flow direction when the...

Graham Eaton / Speke's Mill Mouth waterfall near Hartland Quay, Devon, UK, March. The waterfall flows down near vertical beds of Carboniferous sandstone.

Graham Eaton / En echelon tension (or parallel) cracks in Carboniferous age turbidite sandstones, Bude, Cornwall, UK, May. The tension cracks have formed in the more competent sandstones as the rocks were folded. T...

Graham Eaton / A thrust fault in Carboniferous age Sandstones and shales (Culm Measures) at Crackington Haven, near Bude, Cornwall, March. The rocks comprise the Crackington Formation of thinly bedded turbidite sand...

Graham Eaton / A thrust fault in Carboniferous age Sandstones and shales (Culm Measures) at Crackington Haven, near Bude, Cornwall, March. The rocks comprise the Crackington Formation of thinly bedded turbidite sand...

Graham Eaton / A small relay thrust fault in steeply dipping Carboniferous age Sandstones and shales (Culm Measures) near Bude, Cornwall, March.

Graham Eaton / An eroded synclinal fold exposed Carboniferous age sandstones and shales. Hartland Quay, Devon, UK, May

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...

Graham Eaton / A box fold formed by intersecting kink folds in Carboniferous age Sandstones and Shales (Culm Measures) at Menanchrurch near Bude, Cornwall, March. The deformation of the rocks formed during the Varis...

Graham Eaton / Chevron folded Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic cont...

Graham Eaton / A Limestone Pavement with well developed Clints (blocks) and Grykes (gaps). This is Carboniferous age limestone, part of a large area of Karst above Austwick, Yorkshire, UK. Slightly acidic rainfall,...

Graham Eaton / A Limestone Pavement with well developed Clints (blocks) and Grykes (gaps). This is Carboniferous age limestone, part of a large area of Karst above Austwick, Yorkshire, UK. Slightly acidic rainfall,...

Graham Eaton / Load casts on the underside of a sandstone bed of Carboniferous age, Culm Measures (Bude Formation), Bude, Cornwall, UK, May.

Graham Eaton / Load casts on the underside of a sandstone bed of Carboniferous age, Culm Measures (Bude Formation), Bude, Cornwall, UK, May.

Graham Eaton / A monocline fold with a minor thrust fault in Carboniferous age sandstones, Bude, Cornwall, UK, May.

Graham Eaton / The southern approach to Pen-y-ghent, one of theYorkshire '3 Peaks'. The summit comprises Carboniferous age Millstone Grit, overlying Carboniferous Limestone that forms the outcrop in the imag...

Graham Eaton / Chevron recumbent folding in Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late...

Graham Eaton / Tree growing in outcrop of banded Chert, part of the Carboniferous, Pentre Chert formation, Halkyn, Wales, UK, January. The Chert is silicified Limestone, made up in part of micro organism Radiolaria....

Graham Eaton / Hull Pot, Horton in Ribblesdale, Yorkshire, England, UK, January 2017. Hull Pot is a collapsed cave in Carboniferous age limestone. In wet conditions a stream flows into the pot and continues its jour...

Graham Eaton / Small stream dissapears over a waterfall into Hull Pot, Horton in Ribblesdale, Yorkshire, England, UK, January 2017. A walker can be seen in the mist in the background. Hull Pot is a collapsed cave co...

Graham Eaton / Hull Pot, Horton in Ribblesdale, Yorkshire, England, UK, January 2017. Hull Pot is a collapsed cave in Carboniferous age limestone. In wet conditions a stream flows into the pot and continues its jour...

Graham Eaton / Hull Pot, Horton in Ribblesdale, Yorkshire, England, UK, January. Hull Pot is a collapsed cave in Carboniferous age limestone. In wet conditions a stream flows into the pot and continues its journey i...

Graham Eaton / Hull Pot, Horton in Ribblesdale, Yorkshire, England, UK, January. Hull Pot is a collapsed cave in Carboniferous age limestone. In wet conditions a stream flows into the pot and continues its journey i...

Graham Eaton / Carbonifeous (Dinantian) Crinoidal Limestone, Halkyn, Wales. This limestone is wholly made up of fragments of fossil Crinoids.Crinoids are similar to Sea Lillys

Graham Eaton / Carbonifeous (Dinantian) Crinoidal Limestone, with camera lens cap for scale, Halkyn, Wales. This limestone is wholly made up of fragments of fossil Crinoids.

Graham Eaton / Outcrop of banded Chert, part of the Carboniferous, Pentre Chert formation, Halkyn, Wales, UK. January. The Chert is silicified Limestone, made up in part of micro organism Radiolaria. This is one of...

Graham Eaton / Outcrop of banded Chert, part of the Carboniferous, Pentre Chert formation, Halkyn, Wales, UK. January. The Chert is silicified Limestone, made up in part of micro organism Radiolaria. This is one of...

Graham Eaton / Monocline fold that has been faulted during the Variscan orogeny, in Carboniferous sandstone and shale. Broad Haven, Pembrokeshire, Wales, UK, May

Graham Eaton / Large anticlinal fold, caused by deformation during the Variscan orogeny, in Carboniferous, Coal Measures sandstones and shale. Braod Haven, Pembrokeshire, Wales

Graham Eaton / Small anticlinal fold in Carboniferous, Coal Measures rocks. Broad Haven, Pembrokeshire, Wales, UK, May.

Graham Eaton / Small anticlinal fold in carboniferous, Coal Measures rocks, Broad Haven, Pembrokeshire, Wales, UK, May.

Graham Eaton / Monocline fold that has been faulted during the Variscan orogeny, in Carboniferous sandstone and shale. Broad Haven, Pembrokeshire, Wales, UK, May

Graham Eaton / A monocline fold that has been faulted during the Variscan orogeny, in Carboniferous sandstone and shale. Broad Haven, Pembrokeshire, Wales, UK, May

Graham Eaton / Tree and rock formations at Brimham Rocks, Harrogate, Yorkshire. Comprised of Carboniferous age, Millstone Grit, these strange rock formations form by variable erosion of soft and hard layers in the r...

Graham Eaton / The Back Tor, an outcrop of Carboniferous, Bowland Shale, near Castleton, Derbyshire, England, UK. March

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Graham Eaton / St Govan's Chapel built in the 14th century, into cliffs of Carboniferous Limestone near St Govan's Head, Bosherston, Pembrokeshire, Wales, UK, May

Graham Eaton / St Govan's Chapel built in the 14th century, into cliffs of Carboniferous Limestone near St Govan's Head, Bosherston, Pembrokeshire, Wales, UK, May

Graham Eaton / St Govan's Chapel built in the 14th century, into cliffs of Carboniferous Limestone near St Govan's Head, Bosherston, Pembrokeshire, Wales, UK, May

Graham Eaton / St Govan's Chapel built in the 14th century, into cliffs of Carboniferous Limestone near St Govan's Head, Bosherston, Pembrokeshire, Wales, UK, May

Nick Hawkins / Fossil of a megasecopterid, a dragonfly like insect of the Carboniferous period. Joggins Fossil Cliffs UNESCO World Heritage Site along the shore of the Bay of Fundy in Nova Scotia, Canada. May 2017

Nick Hawkins / Fossil skull of Dendrerpeton acadianum, a large amphibian of the Carboniferous period. Joggins Fossil Cliffs UNESCO World Heritage Site along the shore of the Bay of Fundy in Nova Scotia, Canada. May...

Nick Hawkins / Barnacles growing on the fossilized remains of Calamites, a common plant during the Carboniferous period. Joggins Fossil Cliffs UNESCO World Heritage Site, Bay of Fundy in Nova Scotia, Canada. May 201...

Graham Eaton / Potholes in carboniferous limestone beds, created by small pebbles in eddy currents eroding rock when River Ure is in spate, Lower Aysgarth Falls, Leyburn, Yorkshire, England, UK, October 2016.

Graham Eaton / Druids Writing Desk, rock pedestal created by variable erosion of soft and hard layers of carboniferous age millstone grit, Brimham Rocks, Harrogate, Yorkshire, England, UK, October 2016.

Graham Eaton / Rock pedestal created by variable erosion of soft and hard layers of carboniferous age millstone grit, Brimham Rocks, Harrogate, Yorkshire, England, UK, October 2016.

Graham Eaton / Rock formations at Brimham Rocks created by variable erosion of soft and hard layers of carboniferous age millstone grit, Harrogate, Yorkshire, England, UK, October 2016.

Graham Eaton / Rock pedestal at Brimham Rocks created by variable erosion of soft and hard layers of carboniferous age millstone grit, Harrogate, Yorkshire, England, UK, October 2016.

Graham Eaton / Eglwseg Escarpment, dipping beds of Carboniferous, Dinantian age limestone. Back of hill parallel with bedding layers with scarp face eroding through the beds, Llangollen, Wales, UK,

Graham Eaton / Eglwseg Escarpment, dipping beds of Carboniferous, Dinantian age limestone. Back of hill parallel with bedding layers with scarp face eroding through the beds, Llangollen, Wales, UK, September 2016