Articles | Volume 22, issue 1
https://doi.org/10.1144/jm.22.1.29
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.1144/jm.22.1.29
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Integrated uppermost Campanian–Maastrichtian calcareous nannofossil and foraminiferal biostratigraphic zonation of the northwestern margin of Australia
R. W. Howe
School of Earth & Geographical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia (e-mail: , )
Current address: Energy & Geoscience Institute, The University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, UT 84108, USA (e-mail: )
R. J. Campbell
School of Earth & Geographical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia (e-mail: , )
J. P. Rexilius
International Stratigraphic Consultants Pty Ltd, 73 Rule St., North Fremantle, WA 6159, Australia (e-mail: )
Cited articles
M. C., Apthorpe: Depositional history of the Upper Cretaceous of the Northwest Shelf, based upon Foraminifera, The APPEA Journal, 19, 74-89, 1979.
M. G., Audley-Charles: Evolution of the southern margin of Tethys (North Australian region) from early Permian to late CretaceousIn : (Eds), Gondwana and TethysGeological Society, London, Special Publications, 37: 79–100., 1988.
M. G., Audley-Charles, P. D., Ballantine and R., Hall: Mesozoic–Cenozoic rift–drift sequence of Asian fragments from Gondwanaland, Tectonophysics, 155, 317-330, 1988.
P. W., Baillie, C. M., Powell, Z. X., Li and A. M., Ryall: The tectonic framework of Western Australia’s Neoproterozoic to Recent sedimentary basins, The Sedimentary Basins of Western Australia: Proceedings of the Petroleum Exploration Society of Australia Symposium, 45-62, 1994.
E., Barrera: Global environmental changes preceding the Cretaceous–Tertiary boundary: Early–late Maastrichtian transition, Geology, 22, 877-880, 1994.
E., Barrera, S. M., Savin, E., Thomas and C. E., Jones: Evidence for thermohaline-circulation reversals controlled by sea-level change in the latest Cretaceous, Geology, 25, 715-718, 1997.
J. A., Bergen and P. J., Sikora: Microfossil diachronism in southern Norwegian North Sea chalks: Valhall and Hod fieldsIn : (Eds), Biostratigraphy in Production and Development GeologyGeological Society, London, Special Publications, 152: 85–111., 1999.
A., Boersma: Cretaceous and Tertiary foraminifera from Deep Sea Drilling Project leg 62 sites in the Central PacificIn : (Eds), Initial Reports of the Deep Sea Drilling Project, U.SGovernmentWashington D.C, 377–396., 1981.
P. R., Bown: Calcareous Nannofossil BiostratigraphyBritish Micropalaeontology Society Publications Series, Chapman & Hall/Kluwer Academic Press, 314 pp., 1998.
P. R., Bown and J. R., Young: TechniquesIn : (Ed.), Calcareous Nannofossil BiostratigraphyBritish Micropalaeontology Society Publications Series, Chapman & Hall/Kluwer Academic Press, 16–28., 1998.
T. J., Bralower and J. A., Bergen: Cenomanian–Santonian calcareous nannofossil biostratigraphy of a transect of cores drilled across the Western Interior SeawayIn : (Eds), Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway, USASEPM concepts in sedimentology and paleontology, 6: 59–77., 1998.
T. J., Bralower and W. G., Siesser: Cretaceous calcareous nannofossil biostratigraphy of sites 761, 762, and 763 Exmouth and Wombat plateaus, Northwest Australia, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 601-632, 1992.
D., Bukry: Upper Cretaceous coccoliths from Texas and Europe, The University of Kansas Paleontological Contributions, 51, 1-79, 1969.
J. A., Burnett: New species and biostratigraphical application of Ceratolithoides Bramlette and Martini, 1964 from the Campanian and Maastrichtian of the Indian Ocean, Journal of Nannoplankton Research, 19, 123-131, 1997a.
J. A., Burnett: New species and new combinations of Cretaceous nannofossils, and a note on the origin of Petrarhabdus (Deflandre) Wind & Wise, Journal of Nannoplankton Research, 19, 133-142, 1997b.
J. A., Burnett: Upper CretaceousIn : (Ed.), Calcareous Nannofossil BiostratigraphyBritish Micropalaeontology Society Publications Series, Chapman & Hall/Kluwer Academic Press, 132–199., 1998.
J. A., Burnett, J. M., Hancock, W. J., Kennedy and A. R., Lord: Macrofossil, planktonic foraminiferal and nannofossil zonation at the Campanian/Maastrichtian boundary, Newsletters on Stratigraphy, 27, 157-172, 1992.
J. A., Burnett, W. J., Kennedy and P., Ward: Maastrichtian nannofossil biostratigraphy in the Biscay region (south-western France, northern Spain), Newsletters on Stratigraphy, 26, 145-155, 1992.
M., Caron: Cretaceous planktic foraminiferaIn : (Eds), Plankton Stratigraphy, 1: 17–86., 1985.
P., Chungkham and S. A., Jafar: Late Cretaceous (Santonian–Maastrichtian) integrated coccolith–globotruncanid biostratigraphy of pelagic limestones from the accretionary prism of Manipur, northeastern India, Micropaleontology, 44, 69-83, 1998.
L. J., Clarke and H. C., Jenkyns: New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere, Geology, 27, 699-702, 1999.
F., Dalbiez: The genus Globotruncana in Tunisia, Micropaleontology, 1, 161-171, 1955.
B. F., Ellis and A. R., Messina: et seqCatalogue of ForaminiferaSpecial Publication, American Museum of Natural History., 1945.
N. P., Exon, B. U., Haq and U., von Rad: Exmouth Plateau revisited: scientific drilling and geological framework, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 3-22, 1992.
N. F., Exon, P. E., Borella and M., Ito: Sedimentology of marine Cretaceous sequences in the central Exmouth Plateau (northwest Australia), Proceedings of the Ocean Drilling Program, Scientific Results, 122, 233-258, 1992.
T. D., Frank and M. A., Arthur: Tectonic forcings of Maastrichtian ocean-climate evolution, Palaeoceanography, 14, 103-117, 1999.
S., Gardin and S., Monechi: Calcareous nannofossil distribution in the Tercis geological site (Landes, SW France) around the Campanian–Maastrichtian boundaryIn : (Ed.), The Campanian–Maastrichtian BoundaryDevelopments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 272–292., 2001.
S., Gardin, G. S., Odin, M., Bonnemaison, M., Melinte, S., Monechi and K., von Salis: Results of the cooperative study on the calcareous nannofossils across the Campanian–Maastrichtian boundary at Tercis les Bains (Landes, France)In : (Ed.), The Campanian–Maastrichtian BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 293–309., 2001.
M. F., Glaessner: Principles of Micropaleontology, John Wiley and SonsNew York, 296 pp., 1948.
X., Golovchenko, P. E., Borella and S., O’Connell: Sedimentary cycles on the Exmouth Plateau, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 279-291, 1992.
F. M., Gradstein, F. P., Agterberg, J. G., Ogg, J., Hardenbol, P., van Veen, J., Thierry and Z., Huang: A Mesozoic time scale, Journal of Geophysical Research, 99, 24051-24074, 1994.
B. U., Haq, J., Hardenbol and P. R., Vail: Chronology of fluctuating sea levels since the Triassic, Science, 235, 1156-1166, 1987.
B. U., Haq and U., von Rad: Site 761, Proceedings of the Ocean Drilling Program, Initial Reports, 12, 161-211, 1990.
B. U., Haq and U., von Rad: Site 762, Proceedings of the Ocean Drilling Program, Initial Reports, 122, 213-288, 1990.
J., Hardenbol and F., Robaszynski: Introduction to the Upper CretaceousIn : (Eds), Mesozoic and Cenozoic Sequence Stratigraphy of European BasinsSociety of Economic Paleontologists and Mineralogists, Special Publication, 60: 329–332., 1998.
A. S., Henricksson: Biochronology of the terminal Cretaceous calcareous nannofossil Zone of Micula prinsii, Cretaceous Research, 14, 59-68, 1993.
M. A., Holmes and D. K., Watkins: Middle and Late Cretaceous history of the Indian Ocean, Synthesis of Results from Scientific Drilling in the Indian Ocean, Geophysical Monograph, 70, 225-244, 1992.
N. D. B., Hornibrook, R. C., Brazier and C. P., Strong: Manual of New Zealand Permian to Pleistocene Foraminiferal Biostratigraphy, New Zealand Geological Paleontological Bulletin, 56, 175-1989.
R. W., Howe, D. W., Haig and M. C., Apthorpe: Cenomanian–Coniacian transition from siliciclastic to carbonate marine deposition, Giralia Anticline, Southern Carnarvon Platform, Western Australia, Cretaceous Research, 21, 517-551, 2000.
Z., Huang, R., Boyd and S., O’Connell: Upper Cretaceous cyclic sediments from Hole 762C, Exmouth Plateau, northwest Australia, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 259-277, 1992.
B. T., Huber: Maestrichtian planktonic foraminifer biostratigraphy of the Maud Rise (Weddell Sea, Antarctica): ODP Leg 113 Holes 689B and 690C, Proceedings of the Ocean Drilling Program, Scientific Results, 113, 489-513, 1990.
B. T., Huber: Maestrichtian planktonic foraminifer biostratigraphy and the Cretaceous/Tertiary boundary at Hole 738C (Kerguelen Plateau, Southern Indian Ocean), Proceedings of the Ocean Drilling Program, Scientific Results, 114, 451-495, 1991.
B. T., Huber: Paleobiogeography of Campanian–Maastrichtian foraminifera in the southern high latitudes, Palaeogeography, Palaeoclimatology, Palaeoecology, 92, 325-360, 1992.
B. T., Huber, D. A., Hodell and C. P., Hamilton: Middle–Late Cretaceous climate of the southern high latitudes: Stable isotopic evidence for minimal equator-pole thermal gradients, Geological Survey of America Bulletin, 107, 1164-1191, 1995.
J., Ion and G. S., Odin: Preliminary study of the benthic foraminifera of the Campanian–Maastrichtian section at Tercis les Bains (Landes, France)In : (Ed.), The Campanian–Maastrichtian BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 310–327., 2001.
W. J., Kennedy, W. A., Cobban and G. R., Scott: Ammonite correlation of the uppermost Campanian of Western Europe, the U.S. Gulf Coast, Atlantic Seaboard and Western Interior, and the numerical age of the base of the Maastrichtian, Geological Magazine, 129, 497-500, 1992.
J. M., Kennard, I., Deighton, D. S., Edwards, J. B., Colwell, G. W., O’Brien and C. J., Boreham: Thermal history modelling and transient heat pulses: new insights into hydrocarbon expulsion and ‘hot flushes’ in the Vulcan Sub-basin, Timor Sea, The APPEA Journal, 39, 177-207, 1999.
M., Kucera and B. A., Malmgren: Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean, Marine Micropalaeontology, 28, 31-52, 1996.
K. G., MacLeod: Extinction of Inoceramid bivalves in Maastrichtian strata of the Bay of Biscay region of France and Spain, Journal of Paleontology, 68, 1048-1066, 1994.
K. G., MacLeod: Bioturbation, inoceramid extinction, and mid-Maastrichtian ecological change, Geology, 22, 139-142, 1994.
K. G., MacLeod and B. T., Huber: Reorganization of deep ocean circulation accompanying a Late Cretaceous extinction event, Nature, 380, 422-425, 1996.
K. J., McNamara, J. P., Rexilius, N. G., Marshall and R. A., Henderson: The first record of a Maastrichtian ammonite from the Perth Basin, Western Australia, and its biostratigraphical significance, Alcheringa, 12, 163-168, 1988.
M., Melinte and G. S., Odin: Optical study of the calcareous nannofossils from Tercis les Bains (Landes, France) across the Campanian–Maastrichtian boundaryIn : (Ed.), The Campanian–Maastrichtian BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19Elsevier, Amsterdam, 285–292., 2001.
I., Metcalfe: Gondwanaland dispersion, Asian accretion and evolution of eastern Tethys, Australian Journal of Earth Sciences, 43, 605-623, 1996.
A. J., Mory: Regional geology of the offshore Bonaparte BasinIn : (Eds), The North West Shelf, Australia: Proceedings of Petroleum Exploration Society Australia Symposium, Perth, 287–310., 1988.
R. D., Müller, D., Mihut and S., Baldwin: A new kinematic model for the formation and evolution of the west and northwest Australian MarginIn : (Eds), The Sedimentary Basins of Western Australia 2: Proceedings of Petroleum Exploration Society Australia Symposium, Perth, 73–80., 1998.
A. J., Nederbragt: Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera), Micropaleontology, 37, 329-372, 1991.
A. J., Nederbragt: Quantitative biogeography of late Maastrichtian planktic foraminifera, Micropaleontology, 44, 385-412, 1998.
D., Nöel: Coccolithes des terrains Jurassiques de l’Algerie, Publications, Service de la Carte Geologique (Algerie), Bulletin, 8, 303-345, 1956.
G. W., O’Brien, M. A., Etheridge, J. B., Willcox, M., Morse, P., Symonds, C., Norman and D. J., Needham: The structural architecture of the Timor Sea, North-Western Australia: implications for basin development and hydrocarbon exploration, The APPEA Journal, 33, 258-277, 1993.
G. W., O’Brien, M., Morse, D., Wilson, P., Quiafe, J., Colwell, R., Higgins and C. B., Foster: Margin-scale, basement-involved compartmentalisation of Australia’s North West Shelf: a primary control on basin-scale rift, depositional and reactivation histories, The APPEA Journal, 39, 40-63, 1999.
G. S., Odin: Definition of a Global Boundary Stratotype Section and Point for the Campanian/Maastrichtian boundary, Second International Symposium on Cretaceous Stage Boundaries, Brussels, Sciences de la Terre Aardwetenschappen, Bulletin de l’Institut royal des Sciences naturelles de Belgique, 111-117, 1996.
G. S., Odin: The Campanian–Maastrichtian Stage BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19Elsevier, Amsterdam, 881 pp., 2001a.
G. S., Odin: Numerical age calibration of the Campanian–Maastrichtian succession at Tercis les Bains (Landes, France) and in the Bottaccione Gorge (Italy)In : (Ed.), The Campanian–Maastrichtian BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19Elsevier, Amsterdam, 775–782., 2001b.
G. S., Odin, J. A., Arz, M., Caron and J., Ion: Campanian–Maastrichtian planktonic foraminifera at Tercis les Bains (Landes, France); synthetic view and potential for global correlationIn : (Ed.), The Campanian–Maastrichtian BoundaryIUGS Special Publication (monograph) Series 36, Developments in Palaeontology and Stratigraphy, 19Elsevier, Amsterdam, 379–395., 2001.
J., Pattillo and P. J., Nicholls: A tectonostratigraphic framework for the Vulcan Graben, Timor Sea region, The APEA Journal, 30, 27-51, 1990.
K., Perch-Nielsen: Mesozoic calcareous nannofossilsIn : (Eds), Plankton StratigraphyCambridge University Press, Cambridge, 329–426., 1985.
E. A., Pessagno: Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain, Palaeontographica America, 5, 245-445, 1967.
M. R., Petrizzo: Upper Turonian–lower Campanian planktonic foraminifera from southern mid-high latitudes (Exmouth Plateau, NW Australia): biostratigraphy and taxonomic notes, Cretaceous Research, 21, 479-505, 2000.
J. J., Pospichal and T. J., Bralower: Calcareous nannofossils across the Cretaceous/Tertiary boundary, Site 761, northwest Australian margin, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 735-752, 1992.
C. M., Powell, S. R., Roots and J. J., Veevers: Pre-breakup continental extension in East Gondwanaland and the early opening of the eastern Indian Ocean, Tectonophysics, 155, 261-283, 1988.
I., Premoli-Silva and W. V., Sliter: Cretaceous planktonic foraminiferal biostratigraphy and evolutionary trends from the Bottaccione section, Gubbio, Italy, Palaeontographia Italica, 82, 1-89, 1994.
I., Premoli-Silva and W. V., Sliter: Cretaceous paleoceanography: Evidence from planktonic foraminiferal evolutionIn : (Eds), Evolution of the Cretaceous ocean-climate systemGeological Society of America, Boulder, Special Paper, 332: 301–328., 1999.
J. P., Rexilius: Late Cretaceous foraminiferal and calcareous nannoplankton biostratigraphy, Southwestern Australian MarginPhD ThesisDepartment of Geology & Geophysics, The University of Western Australia, Perth, Western Australia, 291 pp., 1984.
J. B., Risatti: Nannoplankton biostratigraphy of the upper Bluffport Marl-lower Prairie Bluff Chalk interval (upper Cretaceous), in MississippiIn : (Eds), Proceedings of a symposium on calcareous nannofossilsSociety of Economic Paleontologists and Mineralogists, Gulf Coast Section, Houston, Texas, 8–57., 1973.
F., Robaszynski, M., Caron, J. M. G., Donoso and A. A. H., Wonders: Atlas of late Cretaceous Globotruncanids, Revue de Micropaleontologie, 26, 145-305, 1984.
F., Robaszynski and M., Caron: Foraminiferes planctoniques du Cretace: commentaire de la zonation Europe-Mediterranee, Bulletin de la Societe Geologique de France, 166, 681-692, 1995.
P. H., Roth: Cretaceous nannoplankton biostratigraphy and oceanography of the Northwestern Atlantic Ocean, Initial Reports of the Deep Sea Drilling Project, 44, 731-760, 1978.
C. R., Scotese, L. M., Gahagan and R. L., Larson: Plate tectonic reconstruction of the Cretaceous and Cenozoic ocean basins, Tectonophysics, 155, 27-48, 1988.
S., Shafik: Late Cretaceous nannofossil biostratigraphy and biogeography of the Australian western margin, Australian Bureau of Mineral Resources, Report, 295, 164-1990.
S., Shafik: Albian and Maastrichtian nannofloral biogeographic provinces in Western Australia, Australian Geological Survey Organisation Research Newsletter, 19, 15-1993.
S., Shafik: Problems with the Cretaceous biostratigraphic system of Australia: time for a review, Australian Geological Survey Organisation Research Newsletter, 28, 12-14, 1998.
J., Sigal: Essai de zonation du Cretace mediterraneen a l’aide des foraminiferes planctoniques, Geologie Mediterranéenne, 4, 99-108, 1977.
W., Sissingh: Biostratigraphy of Cretaceous calcareous nannoplankton, Geologie en Mijnbouw, 56, 37-65, 1977.
C. C., Smith and E. A., Pessagno: Planktonic foraminifera and stratigraphy of the Corsicana Formation (Maestrichtian) north-central Texas, Cushman Foundation for Foraminiferal Research, Special Publication, 12, 68-1973.
H. I. M., Struckmeyer, M., Yeung and M. T., Bradshaw: Mesozoic palaeogeography of the northern margin of the Australian Plate and its implications for hydrocarbon explorationIn : (Eds), Petroleum Exploration in Papua New Guinea: Proceedings of the First PNG Petroleum Convention: 137–152., 1990.
H. R., Thierstein: Late Cretaceous nannoplankton and the change at the Cretaceous–Tertiary boundaryIn : (Eds), The Deep Sea Drilling Project: a decade of progressSEPM Special Publication: 355–394., 1981.
G., Tronchetti: Les foraminiferes benthiques des affleurements campano–maastrichtiens de Tercis les Bains (Landes, France)In : (Ed.), The Campanian–Maastrichtian BoundaryDevelopments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 314–327., 2001.
G., Tronchetti, J., Ion and G. S., Odin: Benthic foraminifera of the Campanian–Maastrichtian geological site at Tercis les Bains (France); synthesisIn : (Ed.), Developments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 328–337., 2001.
J. E., van Hinte: A Cretaceous time scale, Bulletin of the American Association of Petroleum Geologists, 60, 498-516, 1976.
K., von Salis: Calcareous nannofossils around the Campanian/Maastrichtian Boundary at Tercis, FranceIn : (Ed.), The Campanian–Maastrichtian BoundaryDevelopments in Palaeontology and Stratigraphy, 19, ElsevierAmsterdam, 268–271., 2001.
J. J., Veevers and C. M., Powell: Phanerozoic tectonic regimes of Australia reflect global events, Journal of Structural Geology, 12, 545-551, 1990.
J. J., Veevers, C. M., Powell and S. R., Roots: Review of seafloor spreading around Australia. I. Synthesis of the patterns of spreading, Australian Journal of Earth Sciences, 38, 373-389, 1991.
U., von Rad and T. J., Bralower: Unique record of an incipient ocean basin: Lower Cretaceous sediments from the southern margin of Tethys, Geology, 20, 551-555, 1992.
U., von Rad, N. F., Exon and B. U., Haq: Rift-to-drift history of the Wombat Plateau, northwest Australia: Triassic to Tertiary Leg 122 results, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 765-800, 1992.
P. D., Ward and W. J., Kennedy: Maastrichtian ammonites from the Biscay Region (France, Spain), Journal of Paleontology, Supplement, 67, 1-58, 1993.
D. K., Watkins, S. W., Wise, J., Pospichal James and J., Crux: Upper Cretaceous calcareous nannofossil biostratigraphy and paleoceanography of the Southern OceanIn : (Eds), Microfossils and oceanic environments, University of Wales, Aberystwyth Press, 355–381., 1996.
P. N., Webb: Upper Cretaceous–Paleocene foraminifera from Site 208 (Lord Howe RiseTasman Sea), DSDP, Leg 21In : (Eds), Initial Reports of the Deep Sea Drilling Project, Leg21, US Government Printing OfficeWashington D.C, 541–573., 1973.
A. A. H., Wonders: Middle and Late Cretaceous planktonic Foraminifera of the Western Mediterranean area, Utrecht Micropaleontology Bulletin, 24, 1-158, 1980.
A. A. H., Wonders: Cretaceous planktonic foraminiferal biostratigraphy, Leg 122, Exmouth Plateau, Australia, Proceedings of the Ocean Drilling Program, Scientific Results, 122, 587-599, 1992.
C. A., Wright and M., Apthorpe: Planktonic foraminiferids from the Maastrichtian of the Northwest Shelf, Western Australia, Journal of Foraminiferal Research, 6, 228-241, 1976.
C. A., Wright and M., Apthorpe: C.AWright’s Cretaceous planktonic foraminiferal zonation for the Northwest Shelf, Australia(abstract) Second International Symposium on Cretaceous Stage Boundaries, Institut Royal des Sciences Naturelles de BelgiqueBrussels, 128., 1995.
J. R., Young, J. A., Bergen and P. R., Bown: Guidelines for coccolith and calcareous nannofossil terminology, Palaeontology, 40, 875-912, 1997.
M. A., Zepeda: Planktonic foraminiferal diversity, equitability and biostratigraphy of the uppermost Campanian – Maastrichtian, ODP Leg 122, Hole 762C, Exmouth Plateau, NW Australia, eastern Indian Ocean, Cretaceous Research, 19, 117-152, 1998.