> 570 million years ago: Precambrian sedimentary rocks, Split Rock, Clachtoll, Highland.
AC/58C6/11

510-570 million years ago: Cambrian rocks at Roman Steps, Gwynedd.
RW/50#/6

440-510 million years ago: Ordovician rocks, Cader Idris, Gwynedd.
RH/50C3A/5

410-440 million years ago: Silurian. Pistyll Rhaeadr, Berwyn Mountains, Powys.
GRE/51A1/4

362-410 million years ago: Devonian cliffs near Ayrmer Cove, Devon.
ROY/11S1E/3

290-362 million years ago: Carboniferous sandstone and shale formation, Welcome Bay, Devon.
JOY/11X1A/5

300 million years old, Fossilised tree at Crail, Fife.
AY/56C1/7

245-290 million years old: Permian sandstone cliffs at Oddicombe Beach, Torbay, Devon.
MP/11T1B/3

245-290 million years old: Permian sandstone cliffs at Lympstone, Devon.
HIL/11Z1/7

208-245 million years ago: Triassic sandstone, St Bees, Cumbria.
AC/9B8A/3

145-208 million years ago: Above left, Charmouth, Dorset near Lyme Regis and right Sandsend near Whitby, North Yorkshire. The South and north ends of an outcrop of Jurassic shales stretching across the whole country famous for numerous marine dinosaur fossil finds.
Left: GOL/12C1A/3, right: MK/44W1F/4

65-145 million years ago: Cretaceous chalk cliffs, The Seven Sisters, Kent.
DB/37S2C/1

50-60 million years ago: Octagonal basalt pillars caused by rapid cooling of lava during a particularly active period of volcanism in Northern Ireland and Central Scotland. Fingal's Cave, Staffa, Strathclyde.
IAN/62I2/22

50-60 million years ago: Fossil tree, The Wilderness, Isle of Mull, Strathclyde.
AC/62A2/2

10,000 years ago: Classic U valley created by glaciation in the last ice age. From Bencollaghduff, Twelve Bens, Co Galway.
MAR/IR7A/2

10,000 years ago: Carboniferous limestone polished flat by the ice sheet which covered most of the British Isles during the last ice age. Inishmore, Aran Islands.
ALG/IR7A1C/15