The Student's Handbook of Historical Geology

Ammonites Archæan Arenig Bala bands base basin beds Belemnites beneath Boulder-clay breccia Britain Bunter calcareous Cambrian Carboniferous Limestone Chalk clay Coal-measures coalfield coast conglomerate consists containing Cornbrash Crag Cretaceous deposits Devonian district division Dyas Dyassic east eastward England Eocene estuarine fauna feet thick Flags flints formed fossils freshwater Gault genera Geol Geological Glacial gravel Greensand grey Hills Ireland Journ Jurassic Keuper Kimeridge Lake land lava layers Lias Lincolnshire Lingula Llandeilo Llandovery Lower marine marls Middle miles Millstone Grit Miocene nodules northern northward occupy occur Old Red Sandstone Oligocene Oolite Ordovician overlain Oxford clay Palæozoic pebbles period Pliocene Portrait probably Professor Quart rest Rhætic ridge river rocks sands sandy Scotland shales shells Silurian slates southern species stone strata submergence surface thin tract Trans Tremadoc Trias Triassic unconformably Upper valley volcanic Wales Wealden Wenlock Yorkshire zone