Geology Explained in South Wales

Anticline ashes bands Basal Grits beds belt boulder brachiopod breccias Cambrian Carboniferous Limestone Castle cave Cefn Bryn Cennen clay cliffs Coal Measures coarse coast conglomerates coral Crinoidal Cynon dark deposits Devonian dolerite earth movements east eroded erosion exposed fault Fawr feet felspar Figure Fishguard flowing fold formed fossil fracture gabbro geological Geology Explained glacial Gower grey headland hills Ice Age igneous rocks inlet intrusions island Jurassic lamellibranchs lavas layers Lias Lower marine Mellte miles Millstone Grit mudstones Neath northern occur Old Radnor Old Red Sandstone Oolite Ordovician outcrop pebbly Pembrokeshire Pennant Sandstone Precambrian quarry quartz quartzite Red Marls Rhaetic Rhosili rhyolite ridge river River Neath road sand sea level Seamouth sediments seen shales side Silurian slates slopes South Wales Coalfield southern stone Stonehenge strata surface Swansea Valley Syncline Taff thick thrust Triassic trilobites upfold Upper village volcanic waterfall Welsh western zone