Invertebrate Palaeontology: An Introduction to the Study of Fossils

abundant acmaic acme Ammonites Ammonoids appeared Arthropods attained Bathonian Brachiopods British Cainozoic calcareous Cambrian Caradocian Carboniferous Limestone Cephalopods characteristic characters Clay Coal Measures common Corallian Crag Cretaceous Crinoids Demy 8vo deposits Devonian differentiation Echinoids Eocene evidence evolution extinct families fauna Fcap Fifth Edition Foraminifera forms fossils Fourth Edition Gastropods genera genus geological gerontic Graptolites hemerae horizons Illustrated important Inferior Oolite Invertebrates Isle Jurassic later less Lias Lower Palaeozoic Ludlow marine massive matrix Mesozoic mineral Mollusca morphogenetic moulds Nautiloids neanic numbers occur Oligocene ontogeny Oolite Ordovician organisms palaeontological Palaeozoic Pelecypods period Permian petrifaction phyletic phylogerontic phylum plates Pliocene Polyzoa preservation progress qualities Radiolaria rarely relatively remains represented Rhaetic rock-formers rocks Salop Second Edition sedimentation shales shells Silurian specialization species specimens stage strata stratigraphical structure survived Tertiary Third Edition tion Trias Triassic Trilobites types Upper Chalk Upper Palaeozoic usually Wenlock