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...