The oldest rocks in Britain are found in the Outer Hebrides. These are twisted stones called Lewisian gneisses which were formed up to 3,000 million years ago. This is two-thirds of the known age of our planet. Essentially, they are igneous rocks made from magma deep within the planet, then cooled, crushed, twisted, compressed and layered over vast expanses of time. To walk on and among them is breath-taking.
France58° 13' 10.9164" N, 6° 56' 26.2248" W