Proceedings of the Geologists' Association, Band 95

albite alluvial Ashdown assemblage associated basalt base basement Basin Bed Member Beer Head Borehole Branscombe Cambrian Canyon Carboniferous Cenomanian Chalk Channel Cinder Bed Clay Cliff Coalfield complex composition Conglomerate correlation Cretaceous deposits Dinantian Dyfed early erosion evidence facies Fairlight Fault faunas feldspar floodplain folds Forest Marble Formation fossils Furulund Geol geology grains granite gravel Greensand Greys Limestones Group hardground Hooken hydrocarbon minerals igneous indicate intrusions Jurassic K-feldspar Kokelaar late lavas lherzolite Lias locally Lond London Lower Palaeozoic magmas mantle marine Marl melting Mesozoic Mudstone Neomiodon nodular North Wales occur Old Red Sandstone Oolite Ordovician outcrop overlying Palaeozoic phase pollen Precambrian Proc Purbeck Quarry quartz region Rhabdopleura rocks samples sand sections sedimentary sediments sequence Silurian South Wales stratigraphical structures suggests Sulitjelma surface Surv tectonic thick transgression Triassic tuffs turbidites Turonian Upper Valley volcanic Weald Wealden wedges Welsh Borderland White Limestone zinnwaldite Zone