Drawing a line in the sand: identifying and characterizing boundaries in the geological record, A B Beaudoin and M J Head • Indentifying Phanerozoic extinction controls: statistical considerations and preliminary results, N MacLeod • Deviation from Red Queen behaviour at stratigraphic boundaries: evidence for directional recovery, N A Doran, A J Arnold, W C Parker and F W Huffer • Late Cambrian and Early Ordovician conodont communities from platform and slope facies, western Newfoundland: a statistical approach, S Zhang and C R Barnes • Conodont bioevents, cladistics and response to glacio-eustasy, Ordovician-Silurian boundary through Llandovery, Anticosti Basin, Quebec, S Zhang and C R Barnes • Conodont sample-population approach to defining the base of the Changhsingian Stage, Lopingian Series, Upper Permian, S Mei, C M Henderson and C Cao • Palynostratigraphy of the Upper Carboniferous Langsettian-Duckmantian Stage boundary in Britain, D McLean, B Owens and D Bodman • Foraminifera and ostracodes across the Pliensbachian-Toarcian boundary in the Arctic Realm (stratigraphy, palaeobiogeography and biofacies), B L Nikitenko and M B Mickey • Palynostratigraphy of the classic Portland and Purbeck sequences of Dorset, southern England and the correlation of Jurassic-Cretaceous boundary beds in the Tethyan and Boreal realms, C O Hunt • The mid-Cenomanian non-sequence: a micropalaeontological detective story, M B Hart • Chronostratigraphy of proposed Turonian-Coniacian (Upper Cretaceous) stage boundary stratotypes: Salzgitter-Salder, Germany, and Wagon Mound, New Mexico, USA, P J Sikora, R W Howe, A S Gale and J A Stein • The palynological record across the Cretaceous-Tertiary boundary in differing palaeogeographic settings from the Southern Pyrenees, Spain, M T Fernandez-Marron, N Lopez-Martinez, J F Fonolla-Ocete and M F Valle-Hernandez • Dinoflagellate cyst record of the deep-sea Cretaceous-Tertiary boundary at Uzgrun, Carpathian Mountains, Czech Republic, P Gedl • Upper Palaeocene and lower Eocene interval in the Dieppe-Hampshire Basin: biostratigraphic analysis based on pyritized diatoms, Y Van Eetvelde and C Dupuis • Palaeobiotope analysis and palaeoenvironmental reconstruction of the Paleocene-Early Eocene Ostracodes from east-central Sinai, Egypt, A M T Elewa and A M M Morsi • Dinoflagellate cyst record of the Eocene-Oligocene boundary succession in flysch deposits at Leluchow, Carpathian Mountains, Poland, P Gedl • Palynostratigraphy and palaeoenvironments across the Oligocene-Miocene boundary within the Centinela Formation, southwest Argentina, G R Guerstein, M V Guler and S Casadio •