Graham Eaton / View towards Cribyn from Pen y Fan in the Brecon Beacons National Park, Wales, September. The outcrops of Devonian age, Old Red Sandstone forms escarpments carved by glaciers during the last ice age.

Graham Eaton / View towards Cribyn from Pen y Fan in the Brecon Beacons National Park, Wales, September. The outcrops of Devonian age, Old Red Sandstone forms escarpments carved by glaciers during the last ice age.

Will Watson / Maen Llia Standing Stone composed of intraformational conglomerate from the Devonian Old Red Sandstone Succession, attributed to the Bronze Age. Brecon Beacons National Park, Powys, Wales, UK. August...

Will Watson / Erratic boulder deposited beside Llansgorse Lake during the last Ice-Age, an Intraformational conglomerate from the Old Red Sandstone Succession, Devonian Period, and drystone wall, Brecon Beacons Nat...

Will Watson / Intraformational conglomerate boulder, Old Red Sandstone Succession, Devonian Period, Llyn y Fan Fawr; glacial lake, Black Mountain, Brecon Beacons National Park, Breconshire, Wales, August 2018.

Will Watson / Maidenhair spleenwort (Asplenium trichomanes) growing on an Old Red Sandstone wall, Brecon Beacons National Park, Breconshire, Wales, UK. October 2018.

Will Watson / Landslip chasm and Devonian Old Red Sandstone shattered rocks, Cwmyoy Graig, Brecon Beacons National Park, Monmouthshire, Wales, UK, October 2018.

Will Watson / Landslip chasm and Devonian Old Red Sandstone shattered rocks, Cwmyoy Graig, Brecon Beacons National Park, Monmouthshire, Wales, UK, October 2018.

Will Watson / Snow in the Olchon Valley, a U-shaped valley with shattered rocks belonging to the Senni Formation of Devonian Old Red Sandstone. Cat's Back, Black Mountains, Herefordshire, England, UK. March, 20...

Will Watson / Snow on Black Hill / Cat's Back and the Black Mountains with exposed Old Red Sandstone from the Senni Formation, Devonian Period. Golden Valley, Herefordshire, England, UK. March, 2018.

Ashley Cooper / Sunset over the sea cliffs of St Bees Head West, Cumbria, England, UK.

Will Watson / Old fashioned pink rose climbing on Old Red Sandstone Cottage, Herefordshire Plateau, England, UK, May 2017.

Will Watson / Saxon herringbone pattern stone wall at Old Edvin Loach Church, 11th Century, composed of Old Red Sandstone, Herefordshire, England, UK, October 2017.

Will Watson / Saxon herringbone pattern stone wall at Old Edvin Loach Church, 11th Century, composed of Old Red Sandstone, Herefordshire, England.

Will Watson / Maen Llia standing stone composed of intraformational conglomerate from Old Red Sandstone, attributed to the Bronze Age, Brecon Beacons National Park, Powys, Wales, UK,

Will Watson / Maen Llia standing stone composed of intraformational conglomerate from Old Red Sandstone, attributed to the Bronze Age, Brecon Beacons National Park, Powys, Wales, UK

Will Watson / Maen Llia standing stone composed of intraformational conglomerate from Old Red Sandstone, attributed to the Bronze Age, Brecon Beacons National Park, Powys, Wales, UK

Will Watson / People looking at triassic New Red Sandstone cliffs of the Wilmslow Group, circa 250 million years old, Hawkstone Ridge, Hawkstone Follies, Shropshire, England, UK, May 2015.

Will Watson / Copper stained rock caused by mineralisation which forms malachite, Grinshill Sandstone, Triassic New Red Sandstone Formation, circa 250 million years old, Hawkstone Ridge, Hawkstone Follies, Shropshi...

Will Watson / Oak (Quercus robur) growing on Triassic New Red Sandstone cliff of the Grinshill Sandstone, circa 250 million years old, Hawkstone Ridge, Hawkstone Follies, Shropshire, England, UK, May.

Will Watson / Copper stained rock caused by mineralisation which forms malachite, Grinshill Sandstone, Triassic New Red Sandstone Formation, circa 250 million years old, Hawkstone Ridge, Hawkstone Follies, Shropshi...

John Cancalosi / Upper old red sandstone (quartz conglomerate) from Wye Valley Gorge, Herefordshire, UK.

Brent Stephenson / Northern gannet (Morus bassanus) breeding colony on the Old Red Sandstone cliffs, with birds wheeling through the air. Little Skellig, County Kerry, Republic of Ireland. July.

Brent Stephenson / Northern gannet (Morus bassanus) breeding colony on the Old Red Sandstone cliffs of this rugged island, with birds wheeling through the air. Little Skellig, County Kerry, Republic of Ireland. July.

Brent Stephenson / Northern gannet (Morus bassanus) breeding colony on the Old Red Sandstone cliffs, with birds wheeling through the air. Skellig Michael in the distance to the left, Little Skellig in the foreground, Co...

Brent Stephenson / Northern gannet (Morus bassanus) breeding colony on the Old Red Sandstone cliffs, with birds wheeling through the air. Little Skellig in the foreground, County Kerry, Republic of Ireland. July.

Niall Benvie / Old red sandstone with pebble from conglomerate, Scotland, UK

Niall Benvie / Lower old red sandstone erosion, exposing lamination, Arbroath, Angus, Scotland.

Martin Dohrn / Old red sandstone exposed on coastal cliffs at Skokholm, Wales, UK

Niall Benvie / Arbroath cliffs, De'ils Heid, lower old red sandstone stack, Arbroath, Angus, Scotland, UK, Europe

Niall Benvie / Old red sandstone with pebbles from conglomerate. Scotland. Patterns, close-ups, coasts.

Paul D Stewart / 1856 portrait of Hugh Miller, Scottish geologist and palaeontologist, born 1802 died 1856. Photographic frontispiece of author by J.G. Tunny in some first editions of Miller's posthumous 1857 book 'Te...

Graham Eaton / Fan y Big, Cribyn and Pen y Fan viewed from the south east, with storm clouds approaching. These are three glacial cwm's, corries / cirques carved into the Devonian, Old Red Sandstone escarpment,...

Graham Eaton / Cwm Oergwm corrie and glacial valley of Devonian red sandstone, view towards peaks of Fan y Big, Cribyn, Pen Y Fan and Corn Du. Brecon Beacons National Park, Wales, UK. May 2019.