Guy Edwardes / Grykes in limestone pavement at sunset,, Twisteleton Scar End, Yorkshire Dales National Park, Yorkshire, England, UK, May 2013.

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 / 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

Jason Smalley / Eratic boulders on limestone pavement Yorkshire Dales above Ingleton UK