The Student's Handbook of Historical Geology

Ammonites Archæan Arenig Bala bands base basin beds Belemnites beneath Boulder-clay breccia Britain British 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 Edition England Eocene estuarine fauna feet thick Flags flints formed fossils freshwater Gault genera Geol Geology Glacial gravel Greensand grey grits Hills Ireland Journ Jurassic Keuper Kimeridge Lake land lava Lias Lincolnshire Lingula Llandeilo Llandovery Lower marine marls Middle miles Millstone Grit Miocene nodules northern northward occur Old Red Sandstone Oligocene Oolite Ordovician overlain Oxford clay Paleozoic 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 Tremadoc Trias Triassic unconformably Upper valley volcanic Wales Wealden Wenlock Yorkshire zone