Based on high-resolution planktonic foraminiferal biostratigraphical analysis at El Kef stratotype section (GSSP for the K/Pg boundary), Ellès section in Tunisia, and Agost and Caravaca sections in Spain (Tethyan realm), we attempt to compare biozones and subzones with those of the Bidart section (SW France) (Atlantic realm). The Abathomphalus mayaroensis zone of the upper Maastrichtian corresponds to the taxon range interval of the nominate species. We have identified the Plummerita hantkeninoides subzone. This species is present and associated with Pseudoguembelina hariaensis at the Tethyan realm. However, this species is absent at the middle latitude of the Atlantic realm (Bidart section, SW France). The Pseudoguembelina hariaensis species had larger paleogeographic spread, as it was present in both the Tethys and the Atlantic paleoceans. It is more relevant to be considered as the biomarker of a nominate uppermost Maastrichtian subzone instead of Plummerita hantkeninoides. The Danian stage is characterized by the Gt. cretacea zone, Pv. eugubina zone, and the Parasubbotina pseudobulloides zone. The deposition thickness of the zones and subzones at El Kef stratotype section and Ellès section is more expanded than at Agost and Caravaca sections (Spain) and Bidart section (France). They would be controlled by the sedimentary basin morphology. 1. Introduction At the K/Pg boundary, with most of the Heterohelicids, the Globotruncanids suffered mass extinctions. These extinctions affecting many other biological groups of vertebrates and invertebrates induced a major crisis considered as the most severe and catastrophic biological event in the history of our planet. This crisis documented in many research on the foraminifers groups ([4–6], among others) became more accurate until the specialists began to use the high resolution biostratigraphical analyses ([7–16], among others). The extinction model of planktic foraminifers groups, at the K/Pg boundary, is very controversial. Some authors consider that the lower Danian assemblages include reworked specimens of Maastrichtian taxa [17–19], whereas others have suggested that at least a substantial part of the latest Maastrichtian species survived into the earliest Danian [20, 21]. Deep-water benthic foraminifers were less influenced by the K/Pg boundary event, but their diversity and abundance decreased temporarily [15, 22, 23]. After these K/Pg boundary mass extinctions, small and new planktic foraminiferal species began to appear following an “explosive” adaptive radiation pattern. Consistent debates on the
References
[1]
M. Lindinger, The Cretaceous/Tertiary boundaries of El Kef and Caravaca: sedimentological, geochemical and clay mineralogical aspects [Thesis ETH], 1988.
[2]
V. Pujalte, J. Baceta, A. Payros, X. Orue-Etxebarria, and J. Serra-Kiel, GEP-IGCP 286, Field Sem, 1994.
[3]
C. R. Denham and C. R. Scotese, Terra mobilis: A Plate Tectonic Program for the Macintosh, Geoimages, Austin, Tex, USA, 1987.
[4]
H. P. Luterbacher and I. Premoli Silva, “Biostratigrafia del limite Cretaceo-Terziario nell’Appennino central,” Rivista Italiana di Paleontologia, vol. 70, pp. 67–117, 1964.
[5]
H. M. Bolli, “Zonation of Cretaceous to Pliocene marine sediments based on Planktonic foraminifera,” Boletín Informativo de la Asociación VenezoLana de Geología Minera y Petrolera, vol. 9, no. 1, pp. 1–34, 1966.
[6]
W. A. Berggren and R. D. Norris, Biostratigraphy, Phylogeny and Systematics of Paleocene Trochospiral Planktic Foraminifera, vol. 43 of Micropaleontology, supplement 1, 1997.
[7]
J. Smit, “Extinction and evolution of planktonic foraminifera after a major impact at the Cretaceous/Tertiary boundary,” Geological Society of America, vol. 190, pp. 329–352, 1982.
[8]
G. Keller, “Extinction, survivorship and evolution of planktic foraminifera across the Cretaceous/Tertiary boundary at El Kef, Tunisia,” Marine Micropaleontology, vol. 13, no. 3, pp. 239–263, 1988.
[9]
J. I. Canudo, G. Keller, and E. Molina, “Cretaceous/Tertiary boundary extinction pattern and faunal turnover at Agost and Caravaca, S.E. Spain,” Marine Micropaleontology, vol. 17, no. 3-4, pp. 319–341, 1991.
[10]
E. Molina, I. Arenillas, and J. A. Arz, “The Cretaceous/Tertiary boundary mass extinction in planktic foraminifera at Agost, Spain,” Revue de Micropaleontologie, vol. 39, no. 3, pp. 225–243, 1996.
[11]
R. K. Olsson and C. Liu, “Controversies on the placement of Cretaceous-Paleogene boundary at the K/P mass extinction of planktonic foraminifera,” Palaios, vol. 8, no. 2, pp. 127–139, 1993.
[12]
R. K. Olsson, C. Hemleben, W. A. Berggren, and B. T. Huber, “Atlas of paleocene planktonic foraminifera,” Smithsonian Contributions to Paleobiology, vol. 85, pp. 1–252, 1999.
[13]
N. Gallala, D. Zaghbib-Turki, I. Arenillas, J. A. Arz, and E. Molina, “Catastrophic mass extinction and assemblage evolution in planktic foraminifera across the Cretaceous/Paleogene (K/Pg) boundary at Bidart (SW France),” Marine Micropaleontology, vol. 72, no. 3-4, pp. 196–209, 2009.
[14]
N. Gallala and D. Zaghbib-Turki, “High resolution biostratigraphy based on planktic foraminifera across the Cretaceous-Paleogene transition at the Bidart section (SW France),” Acta Geologica Polonica, vol. 60, no. 2, pp. 243–255, 2010.
[15]
N. Gallala, Micropaléontologie, biostratigraphie, paléoécologie et environnements de dép？t des foraminifères planctoniques et benthiques du passage Crétacé-Paléogène en Tunisie, Espagne et France [Thèse de doctorat], 2010.
[16]
F. BouDagher, “Biostratigraphic and geological significance of planktonic foraminifera,” Developments in Palaeontology and Stratigraphy, vol. 22, pp. 1–301, 2012.
[17]
I. Arenillas, J. A. Arz, and E. Molina, “El límite Cretácio/Tertciario de Zumaya, Osinaga y Músquiz (Pirineos): control bioestratigráfico y cuantitativo de hiatus con foraminíferos planct？nicos,” Revista de la Sociedad Geol？gica De Espa？a, vol. 11, no. 1-2, pp. 127–138, 1998.
[18]
S. Gardin and S. Monechi, “Palaeoecological change in middle to low latitude calcareous nannoplankton at the Cretaceous/Tertiary boundary,” Bulletin de la Societe Geologique de France, vol. 169, no. 5, pp. 709–723, 1998.
[19]
S. Gardin, “Late Maastrichtian to early Danian calcareous nannofossils at Elles (Northwest Tunisia). A tale of one million years across the K-T boundary,” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 178, no. 3-4, pp. 211–231, 2002.
[20]
K. Perch-Nielsen, J. McKenzie, and Q. He, “Biostratigraphy and isotope stratigraphy and the “catastrophic” extinction of calcareous nannoplankton at the Cretaceous/Tertiary boundary,” Geological Society of America, vol. 190, pp. 353–371, 1982.
[21]
G. Keller, L. Li, and N. MacLeod, “The Cretaceous-Tertiary boundary stratotype section at El Kef, Tunisia: how catastrophic was the mass extinction?” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 119, no. 3-4, pp. 221–254, 1996.
[22]
L. Alegret, M. A. Kaminski, and E. Molina, “Paleoenvironmental recovery after the Cretaceous/Paleogene boundary crisis: evidence from the marine Bidart Section (SW France),” Palaios, vol. 19, no. 6, pp. 574–586, 2004.
[23]
N. Gallala, Etude des foraminifères benthiques de l’intervalle du passage Crétacé-Tertiaire des coupes d’Oued El Melah et d’El Aouena (Région de Sejnène, Tunisie): paléontologie [Paléoécologie Mastère], 2004.
[24]
M. Toumarkine and H. P. Luterbacher, “Paleocene and Eocene planktic foraminifera,” in Planktonic, Stratigraphy, H. M. Bolli, J. B. Saunders, and K. Perch-Nielson, Eds., pp. 88–153, Cambridge University Press, 1985.
[25]
W. A. Berggren, D. V. Kent, C. C. Swisher III, and M. P. Aubry, “A revised paleogene geochronology and chronostratigraphy,” in Geochronology, Time and Global Stratigraphic Correlation, W. A. Berggren, Ed., vol. 392, Society of Economic Geologist and Paleontologist, 1995.
[26]
I. Arenillas, J. A. Arz, and E. Molina, “A new high-resolution planktic foraminiferal zonation and subzonation for the lower Danian,” Lethaia, vol. 37, no. 1, pp. 79–95, 2004.
[27]
E. Molina, L. Alegret, I. Arenillas et al., “The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, “Tertiary”, Cenozoic) at El Kef, Tunisia—original definition and revision,” Episodes, vol. 29, no. 4, pp. 263–273, 2006.
[28]
E. Molina, L. Alegret, I. Arenillas et al., “The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, “Tertiary”, Cenozoic): auxiliary sections and correlation,” Episodes, vol. 32, no. 2, pp. 84–95, 2009.
[29]
W. H. Blow, “A study of the morphology, taxonomy, evolutionary relationship and the stratigraphical distribution of some Globigerinidae (mainly Globigerinacea),” in The Cainozoic Globigerinida, E. J. Brill, Ed., vol. 3, pp. 1–1413, Leiden, The Netherlands, 1979.
[30]
I. Arenillas and J. A. Arz, “Origen y filogenia de las primeras especies de foraminíferos planctónicos del Paleoceno basal, tras el límite Cretácio/Terciario,” Actas De 125 Aniversario-XII Bienal De La Real Sociedad De Espa？a De Historia Natural, pp. 281–285, 1996.
[31]
J. A. Arz, I. Arenillas, E. Molina, and R. Sepulveda, “La estabilidad faunística de los foraminíferos planctónicos en el Maastrichtiense superior y su extinción en masa catastrófica en el límite K/T de Caravaca, Espa？a,” Revista Geológica de Chile, vol. 27, pp. 27–47, 2000.
[32]
D. Zaghbib-Turki, N. Karoui-Yaakoub, H. Belayouni, R. Rocchia, and E. Robin, “Enregistrement des évènements remarquables de la limite Crétacé-Tertiaire dans la coupe d’Ellès (Tunisie),” Comptes Rendus de l'Académie des Sciences, vol. 331, pp. 141–149, 2000.
[33]
J. W. Cowie, W. Ziegler, and J. Remane, “Stratigraphic commission accelerates progress, 1984 to 1989,” Episodes, vol. 12, no. 2, pp. 79–83, 1989.
[34]
N. Karoui-Yaakoub, R. Benzarti-Said, and D. Zaghbib-Turki, “Le passage Crétacé-Tertiaire dans la coupe d’Ellès (Tunisie centro-septentrionale),” 12ème Colloque Africain de Micropaléontologie, 1994.
[35]
R. Said-Benzarti, “Les ostracodes du campanien-supérieur à l’Yprésien de la coupe d’ellès (Tunisie du Centre-nord),” Biostratigraphie, Paléoécologie Et Paléogéographie, Bulletin Elf Aquitaine, vol. 20, pp. 197–211, 1998.
[36]
J. A. Arz, I. Arenillas, E. Molina, and C. Dupuis, “Los efectos tafonómico y “Signor-Lipps” sobre la extinción en masa de foraminíferos planctónicos en el límite Cretácico/Terciario de Ellès (Tunicia),” Revista de la Sociedad Geológica de Espa？a, vol. 12, no. 2, pp. 251–267, 1999.
[37]
D. Zaghbib-Turki, N. Karoui-Yaakoub, R. Benzarti-Said, R. Rocchia, and E. Robin, “Révision de la limite Crétacé-Tertiaire de la coupe d’Ellès (Tunisie centro-septentrionale). Proposition d’un nouveau stratotype,” Geobios, vol. 34, no. 1, pp. 25–37, 2001.
[38]
N. Karoui-Yaakoub, D. Zaghbib-Turki, and G. Keller, “The Cretaceous-Tertiary (K-T) mass extinction in planktic foraminifera at Elles I and El Melah, Tunisia,” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 178, no. 3-4, pp. 233–255, 2002.
[39]
G. Keller, T. Adatte, W. Stinnesbeck, V. Luciani, N. Karoui-Yaakoub, and D. Zaghbib-Turki, “Paleoecology of the Cretaceous-Tertiary mass extinction in planktonic foraminifera,” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 178, no. 3-4, pp. 257–297, 2002.
[40]
E. Robin and R. Rocchia, “Ni-rich spinel at the Cretaceous-Tertiary boundary of El Kef, Tunisia,” Bulletin de la Société Géologique de France, vol. 169, pp. 365–372, 1998.
[41]
J. Smit, “Discovery of a planktonic foraminiferal association between the Abathomphalus mayaroensis Zone and the “Globigerina” eugubina Zone at the Cretaceous/Tertiary boundary in the Barranco del Gredero (Caravaca, SE Spain). A preliminary report,” Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, vol. 80, no. 4, pp. 280–301, 1977.
[42]
J. Smit, “The Cretaceous/Tertiary transition in the Barranco del Gredero,” in Proceedings of the 2nd C-T Boundary Events Symposium, W. K. Christensen and T. Birkelund, Eds., pp. 156–163, Spain, 1979.
[43]
J. Smit and J. Hertogen, “An extraterrestrial event at the Cretaceous-Tertiary boundary,” Nature, vol. 285, no. 5762, pp. 198–200, 1980.
[44]
L. W. Alvarez, W. Alvarez, F. Asaro, and H. V. Michel, “Extraterrestrial cause for the Cretaceous-Tertiary extinction,” Science, vol. 208, no. 4448, pp. 1095–1108, 1980.
[45]
J. Smit and G. Klaver, “Sanidine spherules at the Cretaceous-Tertiary boundary indicate a large impact event,” Nature, vol. 292, no. 5818, pp. 47–49, 1981.
[46]
J. Smit and W. G. H. Z. ten Kate, “Trace-element patterns at the Cretaceous-Tertiary boundary-Consequences of a large impact,” Cretaceous Research, vol. 3, no. 3, pp. 307–332, 1982.
[47]
A. Montanari, R. L. Hay, W. Alvarez et al., “Spheroids at the Cretaceous-Tertiary boundary are altered impact droplets of basaltic composition,” Geology, vol. 11, no. 11, pp. 668–671, 1983.
[48]
D. J. DePaolo, F. T. Kyte, B. D. Marshall, J. R. O'Neil, and J. Smit, “Rb-Sr, Sm-Nd, K-Ca, O, and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site,” Earth and Planetary Science Letters, vol. 64, no. 3, pp. 356–373, 1983.
[49]
M. R. Rampino and R. C. Reynolds, “Clay mineralogy of the Cretaceous-Tertiary boundary clay,” Science, vol. 219, no. 4584, pp. 495–498, 1983.
[50]
F. T. Kyte, J. Smit, and J. T. Wasson, “Siderophile interelement variations in the Cretaceous-Tertiary boundary sediments from Caravaca, Spain,” Earth and Planetary Science Letters, vol. 73, no. 2–4, pp. 183–195, 1985.
[51]
S. Vannuci, M. G. Pancani, O. Vaselli, and N. Caradosi, “Mineralogical and geochemical features of the Cretaceous-Tertiary boundary in the Barranco del Gredero section (Caravaca, SE Spain),” Chemical Erde, vol. 50, pp. 189–202, 1990.
[52]
E. Robin, D. Boclet, P. Bonté, L. Froget, C. Jéhanno, and R. Rocchia, “The stratigraphic distribution of Ni-rich spinels in Cretaceous-Tertiary boundary rocks at El Kef (Tunisia), Caravaca (Spain) and Hole 761C (Leg 122),” Earth and Planetary Science Letters, vol. 107, no. 3-4, pp. 715–721, 1991.
[53]
B. Schmitz, “Geochemical high-resolution stratigraphy of Cretaceous/Tertiary boundary in Denmark, Spain and New Zealand,” in Extinction and the Fossil Record, E. Molina, Ed., vol. 5, pp. 121–140, SIUZ Cuadernos Interdisciplinares, 1994.
[54]
M. Ortega Huertas, F. Martínez Ruíz, I. Palomo, and H. Chamley, “Comparative mineralogical and geochemical clay sedimentation in the Betic Cordilleras and Basque-Cantabrian Basin areas at the Cretaceous-Tertiary boundary,” Sedimentary Geology, vol. 94, no. 3-4, pp. 209–227, 1995.
[55]
F. Martínez Ruíz, M. Ortega Huertas, I. Palomo, and P. Acquafredda, “Quench textures in altered spherules from the Cretaceous-Tertiary boundary layer at Agost and Caravaca, SE Spain,” Sedimentary Geology, vol. 113, no. 1-2, pp. 137–147, 1997.
[56]
A. Shukolyukov and G. W. Lugmair, “Isotopic evidence for the cretaceous-tertiary impactor and its type,” Science, vol. 282, no. 5390, pp. 927–929, 1998.
[57]
T. Arinobu, R. Ishiwatari, K. Kaiho, and M. A. Lamolda, “Spike of pyrosynthetic polycyclic aromatic hydrocarbons associated with an abrupt decrease in δ13C of a terrestrial biomarker at the Cretaceous-Tertiary boundary at Caravaca, Spain,” Geology, vol. 27, no. 8, pp. 723–726, 1999.
[58]
K. Kaiho and M. A. Lamolda, “Catastrophic extinction of planktonic foraminifera at the cretaceous-tertiary boundary evidenced by stable isotopes and foraminiferal abundance at Caravaca, Spain,” Geology, vol. 27, no. 4, pp. 355–358, 1999.
[59]
R. Coccioni, L. Fabbrucci, and S. Galeotti, “Terminal Cretaceous deep-water benthic foraminiferal decimation survivorship and recovery at Caravaca (SE Spain),” Paleopelagos, vol. 3, pp. 3–24, 1993.
[60]
R. Coccioni and S. Galeotti, “K-T boundary extinction: geologically instantaneous or gradual event? Evidence from deep-sea benthic foraminifera,” Geology, vol. 22, no. 9, pp. 779–782, 1994.
[61]
L. Alegret, “Recovery of the deep-sea floor after the Cretaceous-Paleogene boundary event: the benthic foraminiferal record in the Basque-Cantabrian basin and in South-eastern Spain,” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 255, no. 1-2, pp. 181–194, 2007.
[62]
F. J. Rodríguez-Tovar and A. Uchman, “Ichnological analysis of the Cretaceous-Palaeogene boundary interval at the Caravaca section, SE Spain,” Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 242, no. 3-4, pp. 313–325, 2006.
[63]
J. Leclerc, “Etude géologique du massif du maigmó et de ses abords,” Tesis De 3er Ciclo De Géologie Structurales, pp. 96–100, 1971.
[64]
A. von Hillebrandt, “Bioestratigrafía del paleógeno del sureste de espa？a (Provincias de Murcia y Alicante),” Cuadernos Geológicos, vol. 5, pp. 135–153, 1974.
[65]
J. J. Groot, R. B. G. de Jonge, C. G. Langereis, W. G. H. Z. ten Kate, and J. Smit, “Magnetostratigraphy of the Cretaceous-Tertiary boundary at Agost (Spain),” Earth and Planetary Science Letters, vol. 94, no. 3-4, pp. 385–397, 1989.
[66]
J. Smit, “Meteorite impact, extinctions and the Cretaceous-Tertiary Boundary,” Geologie en Mijnbouw, vol. 69, no. 2, pp. 187–204, 1990.
[67]
A. Pardo, N. Ortiz, and G. Keller, “Latest Maastrichtian and Cretaceous-Tertiary Boundary Foraminiferal Turnover and Environmental Changes at Agost, Spain,” in Cretaceous Tertiary Mass Extinctions. Biotic and Environmental Changes, N. MacLeod and G. Keller, Eds., pp. 139–171, W.W. Norton & Company, 1996.
[68]
E. Molina, I. Arenillas, and J. A. Arz, “Mass extinction in planktic foraminifera at the Cretaceous/Tertiary boundary in subtropical and temperate latitudes,” Bulletin de la Société Géologique de France, vol. 169, no. 3, pp. 351–363, 1998.
[69]
L. Alegret, E. Molina, and E. Thomas, “Benthic foraminiferal turnover across the Cretaceous/Paleogene boundary at Agost (southeastern Spain): paleoenvironmental inferences,” Marine Micropaleontology, vol. 48, no. 3-4, pp. 251–279, 2003.
[70]
G. W. van Veen, Geological investigations in the region west of Caravaca, South-Eastern Spain [Tesis], Universidad de Amsterdam, 1969.
[71]
J. A. Vera, “La Cordillera Bética. Las Zonas Externas de las Cordilleras Béticas,” in Geología de Espa？a, vol. 2, pp. 218–251, Libro Jubilar J. M. Ríos, 1983.
[72]
C. Seyve, “Nannofossil biostratigraphy of the Cretaceous-Tertiary boundary in the French Basque country,” Bulletin Centres de Recherche Exploration-Production Elf-Aquitaine, vol. 14, no. 2, pp. 553–572, 1990.
[73]
S. K. Haslett, “Planktonic foraminiferal biostratigraphy and palaeoceanography of the Cretaceous-Tertiary boundary section at Bidart, south-west France,” Cretaceous Research, vol. 15, no. 2, pp. 179–192, 1994.
[74]
E. Martini, “Standard Tertiary and Quaternary calcareous nannoplankton zonation,” in Proceedings of the 2nd Planktonic Conference, A. Farinacci, Ed., vol. 2, pp. 739–785, Rome, Italy, 1970.
[75]
A. J. T. Romein and J. Smit, “The Cretaceous/Tertiary boundary: calcareous nannofossil and stable isotopes,” Proceedings Koninklijke Nederlandse Akademie van Wetenschappen, vol. 84, pp. 295–314, 1981.
[76]
M. Renard, O. Delacotte, and R. Letolle, “Le strontium et les isotopes stables dans les carbonates totaux de quelques sites de l’atlantique et de la Téthys,” Bulletin de la Société Géologique de France, vol. 24, pp. 519–534, 1982.
[77]
B. K. Nelson, G. K. MacLeod, and P. D. Ward, “Rapid change in strontium isotopic composition of sea water before the Cretaceous/Tertiary boundary,” Nature, vol. 351, no. 6328, pp. 644–647, 1991.
[78]
P. Bonté, O. Delacotte, M. Renard et al., “An iridium rich layer at the Cretaceous/Tertiary boundary in the Bidart section (southern France),” Geophysical Research Letters, vol. 11, no. 5, pp. 473–476, 1984.
[79]
O. Delacotte, M. Renard, C. Laj, K. Perch-Nielson, I. Premoli-Silva, and S. Clauser, “Magnétostratigraphie et bio stratigraphie du passage Crétacé-Tertiaire de la coupe de Bidart (Pyrénées Atlantiques),” Bulletin du Bureau des Recherches Géologiques et Minières, vol. 3, pp. 243–254, 1985.
[80]
F. Minoletti, M. de Rafelis, M. Renard, and S. Gardin, “Reworking of Maastrichtian-like calcareous nannofossils in the lowermost Danian sediments of bidart section (France): isotopic evidence (carbon and oxygen),” Revue de Micropaleontologie, vol. 47, no. 3, pp. 145–152, 2004.
[81]
B. Peynernes, M. J. Fondecave-Wallez, Y. Gourinard, and P. Eichene, “Stratigraphie séquentielle comparée et grade-datation par les foraminifères planctoniques du Campano-Maastrichtien et du Paléocène de quelques sites d’Europe sud-occidentale et d’Afrique du Nord,” Conte Rendu Académie des Sciences, vol. 324, pp. 839–846, 1997.
[82]
B. Galbrun, “Normal polarity magnetic overprint of chron C29r by diagenetic hematite growth in red marly limestones from Bidart and Loya sections (Pays-Basque, France),” EUG 9, Strasbourg, Terra Nova 9, 1997.
[83]
B. Galbrun and S. Gardin, “New chronostratigraphy of the Cretaceous-Paleogene boundary interval at Bidart (France),” Earth and Planetary Science Letters, vol. 224, no. 1-2, pp. 19–32, 2004.
[84]
R. Rocchia, D. Boclet, P. Bonte, J. Devineau, C. Jehanno, and M. Renard, “Comparaison des distributions de l’iridium observées à la limite Crétacé-Tertiaire dans divers sites Européens,” Mémoire de la Société Géologique de France, vol. 150, pp. 95–103, 1987.
[85]
K. Perch-Nielsen, “Calcareous nannofossils at the Cretaceous/Tertiary boundary near Biarritz, France,” in Cretaceous-Tertiary Boundary Events, W. K. Christensen, Ed., vol. 2, pp. 151–155, University of Copenhagen, Copenhagen, Denmark, 1979.
[86]
A. Gorostidi and M. A. Lamolda, “La nanoflora calcárea y el tránsito KT de la sección de Bidart (SW de Francia),” Revista Espa？ola de Paleontoleontología, pp. 153–168, 1995.
[87]
M. J. Fondecave-Wallez, B. Peybernes, and P. Eichene, “Mise en évidence micropaléontologique d’un flysch Ypréso-Lutétien, ex Crétacé, à matériel triasique resédimenté, dans la coupe de Bidart Nord (Pyrénées atlantiques, Sud-Ouest de la France),” Géologie de la France, vol. 3, pp. 47–56, 1995.
[88]
E. Apellaniz, J. I. Baceta, G. Bernaola-Bilbao et al., “Analysis of uppermost Cretaceous-lowermost Tertiary hemipelagic successions in the Basque Country (western Pyrenees): evidence for a sudden extinction of more than half planktic foraminifer species at the K/T boundary,” Bulletin de la Societe Geologique de France, vol. 168, no. 6, pp. 783–793, 1997.
[89]
P. D. Ward, “Maastrichtian ammonite and inoceramid ranges from Bay of Biscay Cretaceous-Tertiary boundary sections,” in Palaeontology and Evolution; Extinction, M. A. Lamolda, E. G. Kauffman, and O. H. Walliser, Eds., Revista Espa？ola de Paleontología, pp. 119–126, 1988.
[90]
P. D. Ward and W. J. Kennedy, “Maastrichtian ammonites from the Biscay region (France Spain),” Paleontological Society Memoir, vol. 34, pp. 1–58, 1993.
[91]
E. A. Pessagno, “Upper Cretaceous planktonic Foraminifera from the Western Gulf Coastal Plain,” Paleontogr, vol. 537, pp. 243–444, 1967.
[92]
J. A. Postuma, Manuel of Planktonic Foraminifera, Elsevier, Amsterdam, The Netherlands, 1971.
[93]
I. Premoli Silva and H. M. Bolli, “Late cretaceous to eocene planktonic foraminifera and stratigraphy of leg 15 sites in the Caribbean Sea,” in Initial Reports of the Deep Sea Drilling Project 15, N. T. Edgar and J. B. Saunders, Eds., pp. 499–547, Government Printing Office, Washington, DC, USA, 1973.
[94]
J. Sigal, “Essai de zonation du Crétacé méditerranéen à l’aide des foraminifères planctoniques,” Geologie Mediterraneenne, vol. 4, no. 2, pp. 99–108, 1977.
[95]
F. Robaszynski, M. Caron, J. M. Gonzalez Donoso, and A. A. H. Wonders, “Atlas of late cretaceous globtruncanids,” Revue de Micropaléontologie, vol. 26, p. 305, 1984.
[96]
M. Caron, “Cretaceous planktonic foraminifera,” in Plankton Stratigraphy, H. Bolli, J. B. Saunders, and K. Perch Neilson, Eds., pp. 17–86, University Press, Cambridge, UK, 1985.
[97]
B. T. Huber, “Paleocene and early neogene planktonic foraminifer biostratigraphy of sites 738 and744, Kerguelen Plateau (Southern Indian Ocean),” in Proceedings of the Ocean Drilling Program, Scientific Results, J. Barron and B. Larsen, Eds., vol. 119, pp. 427–449, Ocean Drilling Program, College Station, Tex, USA, 1991.
[98]
J. A. Arz and I. Arenillas, “Extinción en masa catastrófica de foraminíferos planctónicos en el límite Cretácico/Terciario del Pirineo occidental (Espa？a),” Revista de la Sociedad Mexicana de Paleontología, vol. 8, no. 2, pp. 146–162, 1998.
[99]
G. Keller, “The Cretaceous-Tertiary boundary transition in the Antarctic Ocean and its global implications,” Marine Micropaleontology, vol. 21, no. 1–3, pp. 1–45, 1993.
[100]
I. Arenillas, J. A. Arz, E. Molina, and C. Dupuis, “The Cretaceous/Paleogene (K/P) boundary at A？n Settara, Tunisia: sudden catastrophic mass extinction in planktic foraminifera,” Journal of Foraminiferal Research, vol. 30, no. 3, pp. 202–218, 2000.
[101]
U. Rohl, J. G. Ogg, T. L. Geib, and G. Wefer, “Astronomical calibration of the Danian time scale,” in Western North Atlantic Palaeogene and Cretaceous Palaeoceanography, D. Kroon, R. D. Norris, and A. Klaus, Eds., vol. 183 of Geological Society Special Publication, pp. 163–183, 2001.
[102]
V. P. Leonov and G. P. Alimarina, “Stratigraphy and planktonic foraminifera of the Cretaceous-Paleogene “Transition” Beds of the central part of the North Caucasus: Collected Papers Geological Faculty, University of Moscow,” in Proceedings of the 21st International Geological Congress, pp. 29–60, 1961.
[103]
J. A. Arz and E. Molina, “Bioestratigrafía y cronoestratigrafía con foraminíferos planctónicos del Campaniense superior y Maastrichtiense de latitudes subtropicales y templadas (Espa？a, Francia y Tunicia),” Neues Jahrbuch Für Geologie Und Pal？ontologie Abhandlungen, vol. 224, no. 2, pp. 161–195, 2002.
[104]
W. A. Berggren and P. N. Pearson, “A revised tropical to subtropical Paleogene planktonic foraminiferal zonation,” The Journal of Foraminiferal Research, vol. 35, no. 4, pp. 279–298, 2005.
[105]
J. Smit, W. Alvarez, A. Montanari, et al., ““Tektites” and microkrystites at the Cretaceous/Tertiary boundary: two strewn fields, one crater?” Proceedings of Lunar and Planetary Science, vol. 22, pp. 87–100, 1992.
