Derived from the characteristically coloured marls and sandstones which occur beneath the chalk is a late Cretaceous lithostratigraphic group,  particularly along the coast of one of six countries that make up what?
County Antrim County Antrim (named after the town of Antrim, from Irish: "Aontroim" , meaning "lone ridge" , )) is one of six counties that form Northern Ireland. Adjoined to the north-east shore of Lough Neagh, the county covers an area of 3046 km2 and has a population of about 618,000. County Antrim has a population density of 203 people per square kilometer / 526 people per square mile. It is also one of the thirty-two traditional counties of Ireland, as well as part of the historic province of Ulster.
Skrinkle Sandstones Group The Skrinkle Sandstones Group is a late Devonian to early Carboniferous lithostratigraphic group (a sequence of rock strata) in west Wales. The name is derived from the bay of Skrinkle Haven in south Pembrokeshire. The Group comprises the Gupton and overlying West Angle formations and is up to 300m thick. It was deposited south of the east-west aligned Ritec Fault.