Question: 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?

<P0-S0> The Ulster White Limestone Group is a late Cretaceous lithostratigraphic group (a sequence of rock strata) in Northern Ireland. <P0-S1>  The name is derived from the characteristic chalk rock which occurs particularly along the Antrim coast. <P0-S2>  The strata are exposed on or near to both the northern and eastern coasts of Antrim and also between Portrush and Dungiven within County Londonderry. <P0-S3>  Further outcrops occur between Belfast and Lurgan and between Dungannon and Magherafelt. <P0-S4>  The current names replace an earlier situation where the present group was considered to be a formation and each of the present formations was considered a 'member'. <P0-S5>  Several other stratigraphic naming schemes were in use during the nineteenth century and much of the twentieth century. <P0-S6>  This group and the underlying Hibernian Greensands Group are the stratigraphical equivalent of the Chalk Group of southern and eastern England. <SEP> <P1-S0>  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. <P1-S1>  County Antrim has a population density of 203 people per square kilometer / 526 people per square mile. <P1-S2> County Antrim (named after the town of Antrim, from Irish: "Aontroim" , meaning "lone ridge" , )) is one of six counties that form Northern Ireland. <P1-S3>  It is also one of the thirty-two traditional counties of Ireland, as well as part of the historic province of Ulster. <SEP> <P2-S0> The Hibernian Greensands Group is a late Cretaceous lithostratigraphic group (a sequence of rock strata) in Northern Ireland. <P2-S1>  The strata are exposed on or near to both the northern and eastern coasts of Antrim and also between Portrush and Dungiven within County Londonderry. <P2-S2>  Further outcrops occur between Belfast and Lurgan and between Dungannon and Magherafelt. <P2-S3>  The name is derived from the characteristically coloured marls and sandstones which occur beneath the chalk particularly along the Antrim coast. <P2-S4>  The current names replace an earlier situation where the present group was considered to be a formation and each of the present formations was considered a 'member'. <P2-S5>  Several other stratigraphic naming schemes were in use during the nineteenth century and much of the twentieth century. <P2-S6>  Various units were earlier referred to as glauconitic or chloritic marls. <P2-S7>  This group and the overlying Ulster White Limestone Group are the stratigraphical equivalent of the Chalk Group of southern and eastern England. <SEP> <P3-S0> The Bacton Group is a Triassic lithostratigraphic group (a sequence of rock strata) beneath the southern part of the North Sea. <P3-S1>  The name is derived from Bacton on the Norfolk coast.These strata which are up to 600m thick are the offshore equivalent of the Roxby Formation and Sherwood Sandstone Group which occur in northeast England. <P3-S2>  The Group comprises a lower Bunter Shale Formation of red and brown to grey mudstones and an upper Bunter Sandstone Formation of dolomitic sandstones with mudstone interlayers.