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 Date: 2010-07-20 04:02:19Paleozoic Ordovician Orthoceras Cameroceras Endocerida Orthocerida Ormoceras Actinocerida Cincinnati Arch Nautiloids Phanerozoic Geologic time scale |
 | Journal of the History of Biology: 209–237 DOIs10739y SpringerStephen Jay Gould, Jack Sepkoski, and the ‘QuantitativeDocID: 1mQTP - View Document |
 | Alvarez, W., L.W. Alvarez, F. Asaro, and H.V. MichelThe end of the Cretaceous: Sharp boundary or gradual transition? Science, 223, Bohor, B.F., E.E. Foord, P.J. Modreski, and D.M. TriplehornMinDocID: 14foI - View Document |
 | The monster nautiluses of the Palaeozoic Dr Neale Monks (UK) T he handful of nautilus speciesDocID: 13syA - View Document |
 | 12064_2008_53_Article 1..9DocID: 12K1J - View Document |
 | Explanation of Plate 2 (All figures 3 times natural size. In each transverse section the counter septum is placed at the top.) Lophophyllidium mundulum, n. sp., Pumpkin Creek limestone, 220 feet above Lester limestone,DocID: RRC6 - View Document |