Tricolour cliffs
The cliffs at Hunstanton, Norfolk are famous for their colour bands.
The lowest dark brown layer was laid down in warm shallow seas 70 million years ago. It is 'carstone' made of sand and iron compounds. Local builders use it. The younger much thinner 'red rock' layer above it is chalk coloured with iron pigments. Above that is a thick layer of white chalk.
All contain fossils but frequent rock falls make it dangerous to be too close.
Tricolour cliffs
The cliffs at Hunstanton, Norfolk are famous for their colour bands.
The lowest dark brown layer was laid down in warm shallow seas 70 million years ago. It is 'carstone' made of sand and iron compounds. Local builders use it. The younger much thinner 'red rock' layer above it is chalk coloured with iron pigments. Above that is a thick layer of white chalk.
All contain fossils but frequent rock falls make it dangerous to be too close.