Ashley Cooper / Bulldozers rebuilding the storm beach in Cley, Norfolk, England, UK.

Ashley Cooper / Solar panels on a house in Cley on the North Norfolk coast, UK. October 2014

John Cancalosi / Hertfordshire puddingstone, conglomerate, flint clasts in a silicious matrix, Hertfordshire, England

Jiri Lochman / Flint flakes, Mungo National Park, Willandra Lakes UNESCO Natural World Heritage Site, New South Wales, Australia.

Graham Eaton / Vertical beds of Cretaceous chalk, with layers of flint and rotated normal faults, Jurrasic Coast, near Durdle Door, Dorset, England, UK.

Graham Eaton / Vertical beds of Cretaceous chalk, with layers of flint and rotated normal faults, Jurrasic Coast, near Durdle Door, Dorset, England, UK.

John Cancalosi / Hertfordshire Puddingstone, a conglomerate of well rounded flint pebbles, embedded in a matrix of fine pale coloured sand, all bound together by hard natural silica cement, Hertfordshire, england

John Cancalosi / Hertfordshire puddingstone, a conglomerate sedimentary rock consisting of flint pebbles cemented by quartz matrix, Hertfordshire, England.

Gary K. Smith / Derelict flint barn on rural roadside. Norfolk, England, UK. February.

Paul D Stewart / Four tools of the mesolithic / neolithic period made from Red deer antlers. Dates range from approximately 5000 - 2000 BC. From left (and top) an antler mining pick retrieved from a British flint min...

Will Watson / Flint nodule or Adder / Hag stone, with central hole, formed in the upper Cretaceous Period circa 80 million years old, Hertfordshire, England, UK.

Terry Whittaker / Male Peregrine falcon (Falco peregrinus) looking around whilst perched on a flint/chert nodule protruding from the White Cliffs of Dover, Kent, England, UK, May.