The Quarterly Journal of the Geological Society of London, Volumen 84,Partes 3-4

Aberdaron acid albite analcite analcite-syenite angle Anglesey appear Arvon Ashgillian augite bands basalts basic breccias Caradocian Carboniferous cherts chlorite coast conglomerates contain Cretaceous crinanite crystals D.Sc deposits Douvillé dykes Eocene exposed fauna feet felspar folding fossils fragments gabbro Geirch Genus Geol Geological Gneisses granite granophyre Greenly grits Gwna Group Gwyddel Beds Hatat Hawasina horizon Howford Bridge igneous intrusions Jabal lava limestone Lleyn loam lower Maestrichtian Malih massive Meifod mélange miles mineral Mona Complex mudstones Musandam Musandam Limestone Mynydd occur Occurrence.-Jabal olivine Oman Ordovician outcrop Palæozoic Pelmatozoa Penmynydd Penmynydd Zone Permian phyllites plates Porth Pre-Cambrian probably Productus Prof Q. J. G. S. vol quartz quartzite region rocks sandstones schists sediments seen Semail Series shales sill Society Sowerby species specimens spilites structure sub-zone Surv syncline tectonic thick thin thrust titanaugite tuffs unconformity Upper Valentian vertical Wadi whorls