Geological Excursions in Dyfed, South-west Wales

Abereiddi Aberystwyth Albion Sands anticline Arenig axial bands basal base BASSETT Bay Formation beach bioturbated Blue Head brachiopods Caerbwdy Caerfai calcretes Cambrian Carboniferous channel clasts cleavage Cliff Formation coarse conglomerates Coralliferous Group cross bedded deformation deposits dolerite Dyfed excursion exposed exposures facies fauna Fishguard folds fossils Freshwater West gabbro Gateholm Geol Geological grained graptolites gravel Gray Sandstone Group grey Grits headland horizons interbedded intrusion itinerary laminated Limestone Lindsway Bay Lingula Llandeilo Llanvirn locality Lond Lower marine Marloes metres Milford Haven Moor Cliffs mudstones occur Old Red Sandstone Ordovician outcrop overlying palaeocurrents pebbly Pembrokeshire pingo Precambrian quarry quartz rhyolitic ripple road rocks sandstone member Sandy Haven Sandy Haven Formation sedimentary sediments sequence shales side siltstones silty Silurian Solva beds South Wales St David's stratigraphical structures syncline Tenby thick thin trilobites tuffs turbidites unconformably upper Variscan veins Waterwynch wrench fault zone