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alluvium anhydrite Antrim bands basalt Belfast area bore borehole boulder clay Bunter Sandstone Collin Glen Cretaceous Crumlin deposits district drift Dtreet dykes east esker Estuarine Clay exposed Fault fauna fine-grained flint flow fossils fragments ft in ft Geol Geological glauconitic Glauconitic Sands Glen Bridge Glenavy grains Green Beds greywackes grits Hibernian Greensand Hill Keuper Marl Klaus Lagan Valley laminated clay Langford Lodge Langford Lodge Borehole lavas lignite Limestone Linne)-P Lisburn Lough Neagh Lough Neagh Clays Lower Basalts Magnesian Limestone massive medium-grained micaceous mile Moira mudstone north-east north-west Northern Ireland occur Ordovician outcrop overlying Palaeozoic peat pebbles Permian Permian Marls pits quarry quartz Ravernet recorded reddish brown Rhaetic River Road sand and gravel sandy seen shales silty Silurian sleech small exposures south-east south-west specimens stone stream Thickness Depth ft thin Triassic Upper Visscher White Limestone Yellow Sandstones Zone