Chicxulub impact spherules in the North Atlantic and Caribbean: Age constraints and Cretaceous-Tertiary boundary hiatus

Geological Magazine

Volumn 150, Issue 5, 2013, Pages 885-907

  Keller, Gerta ^a   Khozyem, Hassan ^b   Adatte, Thierry ^b   Malarkodi, Nallamuthu ^c   Spangenberg, Jorge E ^b   Stinnesbeck, Wolfgang ^d  

^a PRINCETON UNIVERSITY   (United States)

^b UNIVERSITY OF LAUSANNE   (Switzerland)

^c BANGALORE UNIVERSITY   (India)

^d UNIVERSITY OF HEIDELBERG   (Germany)

Author keywords

Chicxulub; Cretaceous tertiary boundary unconformity; Impact spherules; North Atlantic

Indexed keywords

EROSION; OCEAN CURRENTS; SEA LEVEL;

CHICXULUB; CHICXULUB IMPACT; CLIMATE COOLING; CRETACEOUS-TERTIARY BOUNDARY; HIGH RESOLUTION; IMPACT SPHERULES; NORTH ATLANTIC; STABLE ISOTOPES;

GEOLOGY;

BIOSTRATIGRAPHY; CRETACEOUS-TERTIARY BOUNDARY; DANIAN; EROSION; FAUNA; HIATUS; IMPACT STRUCTURE; MAASTRICHTIAN; MASS EXTINCTION; REDEPOSITION; STABLE ISOTOPE; UNCONFORMITY;

ATLANTIC OCEAN; ATLANTIC OCEAN (NORTH); BASS RIVER; CARIBBEAN SEA; NEW JERSEY; UNITED STATES;

SPHERULES;

EID: 84880777301     PISSN: 00167568     EISSN: 14695081     Source Type: Journal    
DOI: 10.1017/S0016756812001069     Document Type: Article

References (88)

1. ABRAMOVICH, S. & KELLER, G. 2003. Planktonic foraminiferal response to the latest Maastrichtian abrupt warm event: a case study from South Atlantic DSDP Site 525A. Marine Micropaleontology 48, 225-49.
2. ABRAMOVICH, S., KELLER, G., BERNER, Z., CYMBALISTA, M. & RAK, C. 2011. Maastrichtian planktic foraminiferal biostratigraphy and paleoenvironment of Brazos River, Falls County, Texas. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 123-56. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
3. ABRAMOVICH, S., YOVEL-COREM, S., ALMOGI-LABIN, A. & BENJAMINI, C. 2010. Global climate change and planktic foraminiferal response in the Maastrichtian. Paleoceanography 25, PA2201.
4. ADATTE, T., KELLER, G. & BAUM, G. 2011. Age and origin of the Chicxulub impact and sandstone complex, Brazos River, Texas: evidence from lithostratigraphy, sedimentology and sequence stratigraphy. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 43-80. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
5. ADATTE, T., KELLER, G. & STINNESBECK, W. 2002. Late Cretaceous to early Paleocene climate and sea-level fluctuations. Palaeogeography, Palaeoclimatology, Palaeoecology 178, 165-98.
6. ADATTE, T., STINNESBECK, W. & KELLER, G. 1996. Lithostratigraphic and mineralogical correlations of near-K-T boundary clastic sediments in northeastern Mexico: implications for origin and nature of deposition. In The Cretaceous-Tertiary Event and Other Catastrophes in Earth History (eds G. Ryder, D. E. Fastovsky & S. Gartner), pp. 211-26. Geological Society of America, Special Paper no. 307.
7. ALEGRET, L., ARENILLAS, I., ARZ, J. A., DIAZ, C., GRAJALESNISHIMURA, J. M., MELENDEZ, A., MOLINA, E., ROJAS, R. & SORIA, A. R. 2005. Cretaceous-Paleogene boundary deposits at Loma Capiro, central Cuba: evidence for the Chicxulub impact. Geology 33(9), 721-24.
8. ALEGRET, L., ARENILLAS, I., ARZ, J. A., LIESA, C., MELENDEZ, A., MOLINA, E., SORIA, A. R. & THOMAS, E. 2002. The Cretaceous/Tertiary boundary: sedimentology and micropaleontology at the El Mulato section, NE Mexico. Terra Nova 14(5), 330-6.
9. ARENILLAS, I., ARZ, J. A., GRAJALES-NISHIMURA, J. M., MURILLO-MUNETON, G., ALVAREZ, W., CAMARGO-ZANGUERA, A., MOLINA, E. & ROSALES-DOMINGUEZ, C. 2006. Chicxulub impact event is Cretaceous/Paleogene boundary in age: new micropaleontological evidence. Earth and Planetary Science Letters 249, 241-57.
10. ALEGRET, L., MOLINA, E. & THOMAS, E. 2001. Benthic foraminifera at the Cretaceous/Tertiary boundary around the Gulf of Mexico. Geology 29(10), 891-4.
11. ALEGRET, L. & THOMAS, E. 2004. Benthic foraminifera and environmental turnover at the Cretaceous/Paleogene boundary at Blake Nose (ODP Hole 1049C, Northwestern Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology 208, 59-83.
12. ARZ, J.A., ALEGRET, L. & ARENILLAS, I. 2004. Foraminiferal biostratigraphy and paleoenvironmental reconstruction at the Yaxcopoil-1 drill hole (Chicxulub crater, Yucatan Peninsula). Meteoritics and Planetary Science 39, 1099-112.
13. ARZ, J. A., ARENILLAS, I., SORIA, A. R., ALEGRET, L., GRAJALES-NISHIMURA, J. M., LIESA, C. L., MELÉNDEZ, A., MOLINA, E. & ROSALES, M.C. 2001. Micropaleontology and sedimentology across the Cretaceous/Tertiary boundary at La Ceiba (Mexico): impact-generated sediment gravity flows. Journal of South American Earth Sciences 14, 505-19.
14. BERGGREN, W. A., KENT, D. V., SWISHER, C. C. & AUBRY, M.-P. 1995. A revised Cenozoic geochronology and chronostratigraphy. In Geochronology, Time Scales and Global Stratigraphic Correlation (eds W. A. Berggren, D. V. Kent, M. P. Aubry, & J. Hardenbol), pp. 129-212. Society for Sedimentary Geology (SEPM), Special Publication no. 54.
15. BOURGEOIS, J., HANSEN, T. A., WIBERG, P. & KAUFFMAN, E. G. 1988. A tsunami deposit at the Cretaceous-Tertiary boundary in Texas. Science 141, 567-70.
16. BRALOWER, T. J., PAULL, C. K. & LECKIE, R. M. 1998. The Cretaceous/Tertiary boundary cocktail: Chicxulub impact triggers margin collapse and extensive sediment gravity flows. Geology 26, 331-4.
17. CANDE, S. & KENT, D. V. 1995. Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic. Journal of Geophysical Research 100, 6093-5.
18. COLODNER, D. C., BOYLE, E. A., EDMOND, J. M. & THOMSON, J. 1992. Post-depositional mobility of platinum, iridium, and rhenium inmarine sediments. Nature 358, 402-4.
19. COWIE, J. W., ZIEGLER, W. & REMANE, J. 1989. Stratigraphic Commission accelerates progress, 1984 to 1989. Episodes 12, 79-83.
20. EKDALE, A. A. & STINNESBECK, W. 1998. Ichnology of Cretaceous-Tertiary (K/T) boundary beds in northeastern Mexico. Palaios 13, 593-602.
21. GALE, A. S. 2006. The Cretaceous-Palaeogene boundary on the Brazos River, Falls County, Texas: is there evidence for impact-induced tsunami sedimentation? Proceedings of the Geologists' Association 117, 173-85.
22. GERTSCH, B., KELLER, G., ADATTE, T. & BERNER, Z. 2011. Platinum group element (PGE) geochemistry of Brazos Sections, Texas. In End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 228-49. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
23. GRADSTEIN, F., OGG, J. & SMITH, A. 2004. A Geologic Time Scale. Cambridge: Cambridge University Press, 598 pp.
24. GRAUP, G. & SPETTEL, B. 1989. Mineralogy and phasechemistry of an Ir-enriched pre-K/T layer from the Lattengebirge, Bavarian Alps, and significance for the KTB problem. Earth and Planetary Science Letters 95, 271-90.
25. HUBER, B. T., MACLEOD, K. G. & NORRIS, R. D. 2002. Abrupt extinction and subsequent reworking of Cretaceous planktonic foraminifera across the K/T boundary: evidence from the subtropical North Atlantic, In Catastrophic Events and Mass Extinctions: Impacts and Beyond (eds C. Koeberl & K. MacLeod), pp. 227-89. Geological Society of America, Special Paper no. 356.
26. HUBER, B. T., MACLEOD, K. G. & TUR, N. A. 2008. Chronostratigraphic framework for upper Campanian-Maastrichtian sediments on the Blake Nose (Subtropical North Atlantic). Journal of Foraminiferal Research 38(2), 162-82.
27. KELLER, G. 2008. Impact stratigraphy: old principle-new reality. In The Sedimentary Record of Meteorite Impacts (eds K. R. Evans, J. W. Horton & D. T. King), pp. 147-78. Geological Society of America, Special Paper no. 437.
28. KELLER, G. 2011a. The Cretaceous-Tertiary mass extinction: theories and controversies, In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 7-22. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
29. KELLER, G. 2011b. Defining the Cretaceous-Tertiary Boundary: a practical guide and return to first principles. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 23-42. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
30. KELLER, G., ABRAMOVICH, S., ADATTE, T. & BERNER, Z. 2011. Biostratigraphy, age of the Chicxulub impact and depositional environment of the Brazos River KT sequences. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas (eds G. Keller & T. Adatte), pp. 81-122. Society for Sedimentary Geology (SEPM), Special Publication no. 100.
31. KELLER, G. & ADATTE, T. 2011. The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas. Society for Sedimentary Geology (SEPM), Special Publication no. 100, 315pp.
32. KELLER, G., ADATTE, T., BAUM, G. & BERNER, Z. 2008. Reply to 'Chicxulub impact Predates K-T boundary: new evidence from Brazos, Texas' comment by Schulte et al. Earth and Planetary Science Letters 269, 621-9.
33. KELLER, G., ADATTE, T., BERNER, Z., HARTING, M., BAUM, G., PRAUSS, M., TANTAWY, A. A. & STUEBEN, D. 2007. Chicxulub impact predates K-T Boundary: new evidence from Texas. Earth and Planetary Science Letters 255, 339-56.
34. KELLER, G., ADATTE, T., BERNER, Z., PARDO, A. & LOPEZ-OLIVA, L. 2009. New evidence concerning the age and biotic effects of the Chicxulub impact in Mexico. Journal of the Geological Society, London 166, 393-411.
35. KELLER, G., ADATTE, T., BHOWMICK, P. K., UPADHYAY, H., DAVE, A., REDDY, A. N., JAIPRAKASH, B. C. 2012. Nature and timing of extinctions in Cretaceous-Tertiary planktic foraminifera preserved in Deccan intertrappean sediments of the Krishna-Godavari Basin, India. Earth and Planetary Science Letters 341-344, 211-21.
36. KELLER, G., ADATTE, T., STINNESBECK, W., LUCIANI, V., KAROUI, N. & ZAGHBIB-TURKI, D. 2002. Paleoecology of the Cretaceous-Tertiary mass extinction in planktic foraminifera. Palaeogeography, Palaeoclimatology, Palaeoecology 178, 257-98.
37. KELLER, G., ADATTE, T. & STINNESBECK, W. 2004a. More evidence that Chicxulub predates KT boundary. Meteoritics and Planetary Science 39(6/7), 1127-44.
38. KELLER, G., ADATTE, T., STINNESBECK, W., REBOLLEDOVIEYRA, M., URRUTIA FUCUGAUCHI, J., KRAMAR, U. & STUEBEN, D. 2004b. Chicxulub crater predates K-T boundary mass extinction. Proceedings of the National Academy of Sciences (PNAS) 101(11), 3721-992.
39. KELLER, G., ADATTE, T., STINNESBECK, W., STUEBEN, D. & BERNER, Z. 2001. Age, chemo-and biostratigraphy of Haiti spherule-rich deposits: a multi-event K-T scenario. Canadian Journal of Earth Sciences 38, 197-227.
40. KELLER, G., LI, L. & MACLEOD, N. 1995. The Cretaceous/Tertiary boundary stratotype section at El Kef, Tunisia: how catastrophic was the mass extinction? Palaeogeography, Palaeoclimatology, Palaeoecology 119, 221-54.
41. 3 record across the Cretaceous/Tertiary boundary at ElKef, Tunisia. Palaeogeography, Palaeoclimatology, Palaeoecology 73(3/4), 243-65.
42. KELLER, G., LOPEZ-OLIVA, J. G., STINNESBECK, W. & ADATTE, T. 1997. Age, stratigraphy and deposition of near-K/T siliciclastic deposits in Mexico: relation to bolide impact? Geological Society of America Bulletin 109, 410-28.
43. KELLER, G., LYONS, J. B., MACLEOD, N. & OFFICER, C. B. 1993. Is there evidence for Cretaceous-Tertiary boundary impact deposits in the Caribbean and Gulf of Mexico? Geology 21, 776-80.
44. KELLER, G., STINNESBECK, W., ADATTE, T., HOLLAND, B., STUEBEN, D., HARTING, M., DE LEON, C. & DE LA CRUZ, J. 2003a. Spherule deposits in Cretaceous-Tertiary boundary sediments in Belize and Guatemala. Journal of the Geological Society, London 160, 1-13.
45. KELLER, G., STINNESBECK, W., ADATTE, T. & STUEBEN, D. 2003b. Multiple impacts across the Cretaceous-Tertiary boundary. Earth-Science Reviews 62, 327-63.
46. KLAUS, A., NORRIS, R. D., KROON, D. & SMIT, J. 2000. Impact-induced mass wasting at the K-T boundary: Blake Nose, western North Atlantic. Geology 28, 319-22.
47. KRAMAR, U., STUEBEN, D., BERNER, Z., STINNESBECK, W., PHILIPP, H. & KELLER, G. 2001. Are Ir anomalies sufficient and unique indicators for cosmic events? Planetary and Space Science 49, 831-7.
48. LEE, C.-T., A., WASSERBURG, G. J. & KYTE, F. T. 2003. Platinum-group elements (PGE) and rhenium in marine sediments across the Cretaceous-Tertiary boundary: constraints on Re-PGE transport in the marine environment. Geochimica et Cosmochimica Acta 67(4), 655-70.
49. LI, L. & KELLER, G. 1998a. Abrupt deep-sea warming at the end of the Cretaceous. Geology 26(11), 995-8.
50. LI, L. & KELLER, G. 1998b. Diversification and extinction in Campanian-Maastrichtian planktic foraminifera of northwestern Tunisia. Eclogae Geologica Helvetica 91, 75-102.
51. LI, L. & KELLER, G. 1998c. Maastrichtian climate, productivity and faunal turnovers in planktic foraminifera in South Atlantic DSDP Sites 525A and 21. Marine Micropaleontology 33, 55-86.
52. LOPEZ-OLIVA, J.G. & KELLER, G. 1996. Age and stratigraphy of near-K/T boundary clastic deposits in NE Mexico. Geological Society of America, Special Paper 307, 227-42.
53. MACLEOD, N. & KELLER, G. 1991a. Hiatus distribution and mass extinctions at the Cretaceous-Tertiary boundary. Geology 19, 497-501.
54. MACLEOD, N. & KELLER, G. 1991b. How complete are Cretaceous/Tertiary boundary sections? A chronostratigraphic estimate based on graphic correlation. Geological Society of America Bulletin 103, 1439-57.
55. MACLEOD, K.G., WHITNEY, D. L., HUBER, B. T. & KOEBERL, C. 2007. Impact and extinction in remarkably complete Cretaceous-Tertiary boundary sections from Demerara Rise, tropical western North Atlantic. Geological Society of America Bulletin 119, 101-15.
56. MARTINEZ-RUIZ, F., ORTEGA-HUERTAS, M., PALOMODELGADO, I. & SMIT, J. 2001. K-T boundary spherules from Blake Nose (ODP Leg 171B) as a record of the Chicxulub ejecta deposits. In Western North Atlantic Paleogene and Cretaceous Paleoceanography (eds D. Kroon, R. D. Norris & A. Klaus), pp. 149-61 Geological Society of London, Special Publication no. 183.
57. MAURRASSE, F. J.-M.R. & SEN, G. 1991. Impacts, tsunamis, and the Haitian Cretaceous-Tertiary boundary layer. Science 252, 1690-3.
58. MILLER, K. G., SHERRELL, R. M., BROWNING, J. V., FIELD, M. P., GALLAGHER, W., OLSSON, R. K., SUGARMAN, P. J., TUORTO, S. & WAHYUDI, H. 2010. Relationship between mass extinction and iridium across the Cretaceous-Paleogene boundary in New Jersey. Geology 28, 867-70.
59. MILLER, K. G., SUGARMAN, P. J., BROWNING, J. V., OLSSON, R.K., PEKAR, S. F., REILLY, T. H., CRAMER, B. S., AUBRY, M.-P., LAWRENCE, R. P., CURRAN, J., STEWART, M., METZGER, J. M., UPTEGROVE, J., BUKRY, D., BURCKLE, L. H., WRIGHT, J. D., FEIGENSON, M. D., BRENNER, G. J. & DALTON, R. F. 1998. Bass River Site. In Proceedings of the Ocean Drilling Program, Initial Reports vol. 174AX, pp. 5-43. College Station, Texas. Doi: 10.2973/odp.proc.ir.174AX.101.1998
60. MOLINA, E., ALEGRET, L., ARENILLAS, I., ARZ, J. A., GALLALA, N., HARDENBOL, J., VON SALIS, K., STEURBAUT, E., VANDENBERGHE, N. & ZAGHBIBTURKI, D. 2006. 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 29, 263-73.
61. NORRIS, R. D., FIRTH, J., BLUSZTAJN, J. & RAVIZZA, G. 2000. Mass failure of the North Atlantic margin triggered by the Cretaceous-Paleogene bolide impact. Geology 28, 1119-22.
62. NORRIS, R. D., HUBER, B. T. & SELF-TRAIL, J. 1999. Synchroneity of the KT oceanic mass extinction and meteorite impact: Blake Nose, western North Atlantic. Geology 27, 419-22.
63. NORRIS, R. D., KROON, D., KLAUS, A. et al. 1998. Site 1049. In Proceedings of the Ocean Drilling Program, Initial Reports, vol. 171B (eds L. A. Baez & E. Kapitan-White), pp. 47-86. College Station, Texas.
64. OLSSON, R. K., MILLER, K. G., BROWNING, J. V., HABIB, D. & SUGARMANN, P. J. 1997. Ejecta layer at the Cretaceous-Tertiary boundary, Bass River, New Jersey (Ocean Drilling Program Leg 174AX). Geology 25, 759-62.
65. PRAUSS, M. L. 2009. The K/Pg boundary at Brazos River, Texas-an approach by marine palynology. Palaeogeography, Palaeoclimatology, Palaeoecology 283, 195-215.
66. REMANE, J., KELLER, G., HARDENBOL, J. & BEN HAJ ALI, M. 1999. Report on the International Workshop on Cretaceous-Paleogene Transitions. Episodes 22(1), 47-8.
67. 3 Using a Thermoquest Finnigan GasBench II Delta Plus XL Continuous Flow Isotope Ratio Mass Spectrometer With Application to Devils Hole Core DH-11 Calcite. US Geological Survey Open-File-Report 01-257, 17 pp.
68. SCHRAG, D. P., DEPAOLO, D. J. & RICHTER, F. M. 1995. Reconstructing past sea surface temperatures from oxygen isotope measurements of bulk carbonate. Geochimica et Cosmochimica Acta 59, 2265-78.
69. SCHULTE, P., ALEGRET, L., ARENILLAS, I. et al. 2010. The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary. Science 327, 1214-18.
70. SCHULTE, P., DEUTSCH, A., SALGE, T., BERNDT, J., KONTNY, A., MACLEOD, K., NEUSER, R. D. & KRUMM, S. 2009. A dual-layer Chicxulub ejecta sequence with shocked carbonates from the Cretaceous-Paleogene (K-Pg) boundary, Demerara Rise, western Atlantic. Geochimica et Cosmochimica Acta 73, 1180-204.
71. SCHULTE, P., SPEIJER, R. P., BRINKHUIS, H., KONTNY, A., CALEYS, P., GALEOTTI, S. & SMIT, J. 2008. Comment on the paper; 'Chicxulub impact predates K-T boundary: new evidence from Brazos, Texas' by Keller et al. (2007). Earth and Planetary Science Letters 269, 613-19.
72. SCHULTE, P., SPEIJER, R. P., MAI, H. & KONTNY, A. 2006. The Cretaceous-Paleogene (K-P) boundary at Brazos, Texas: sequence stratigraphy, depositional events and the Chicxulub impact. Sedimentary Geology 184, 77-109.
73. SCHULTE, P., STINNESBECK, W., STUEBEN, D., KRAMAR, U., BERNER, Z., KELLER, G. & ADATTE, T. 2003. Ferich and K-rich mafic spherules from slumped and channelized Chicxulub ejecta deposits in the northern La Sierrita area, NE Mexico. International Journal of Earth Sciences 92, 114-42.
74. SHIPBOARD SCIENTIFIC PARTY 2004. Site 1259. In Proceedings of the Ocean Drilling Program, Initial Reports, vol. 207 (eds J. Erbacher, D. C. Mosher, M. J. Malone et al.), pp. 1-110. College Station, Texas.
75. SIGURDSSON, H., LECKIE, R. M., ACTON, G. D. et al. 1997. Caribbean volcanism, Cretaceous/Tertiary impact, and ocean-climate history: synthesis of leg 165. In Proceedings of the Ocean Drilling Program, Initial Reports vol. 165 (eds C. M. Miller & E. M. Maddox), pp. 377-400. College Station, Texas.
76. SMIT, J. 1999. The global stratigraphy of the Cretaceous-Tertiary boundary impact ejecta. Annual Reviewof Earth and Planetary Sciences 27, 75-113.
77. SMIT, J., MONTANARI, A., SWINBURNE, N. H. M., ALVAREZ, W., HILDEBRAND, A. R., MARGOLIS, S. V., CLAEYS, P., LORIE, W. & ASARO, F. 1992. Tektite-bearing, deepwater clastic unit at the Cretaceous-Tertiary boundary in northeastern Mexico. Geology 20, 99-103.
78. SMIT, J., ROEP, T. B., ALVAREZ, W., MONTANARI, A., CLAEYS, P., GRAJALES-NISHIMURA, J.M. & BERMUDEZ, J. 1996. Coarse-grained clastic sandstone complex at the K/T boundary around the Gulf of Mexico: deposition by tsunami waves induced by the Chicxulub impact. Geological Society of America, Special Paper 307, 151-82.
79. SMIT, J., VAN DER GAAST, S. & LUSTENHOUWER, W. 2004. Is the transition to post-impact rock complete? Some remarks based on XRF sanning, electron-microprobe and thin section analyses of the Yaxcopoil-1 core in the Chicxulub crater. Meteoritics and Planetary Science 39(6), 1-14.
80. SOHL, N. F., MARTINEZ, R. E., SALMERÓN-UREÑA, P. & SOTO-JARAMILLO, F. 1991. Upper Cretaceous. In Geology of North America: The Gulf of Mexico Basin (ed. A. Salvador), pp. 205-44. Boulder: Geological Society of America.
81. STINNESBECK, W., BARBARIN, J. M., KELLER, G., LOPEZ-OLIVA, J. G., PIVNIK, D. A., LYONS, J. B., OFFICER, C. B., ADATTE, T., GRAUP, G., ROCCHIA, R. & ROBIN, E. 1993. Deposition of near K/T Boundary clastic sediments in NE Mexico: impact or turbidite deposits? Geology 21, 797-800.
82. STINNESBECK, W., KELLER, G., SCHULTE, P., STUEBEN, D., BERNER, Z., KRAMAR, U. & LOPEZ-OLIVA, J. G. 2002. The Cretaceous-Tertiary (K/T) boundary transition at Coxquihui, State of Veracruz, Mexico: evidence for an early Danian impact event? Journal of South American Research 15, 497-509.
83. STUEBEN, D., KRAMAR, U., BERNER, Z., ECKHARDT, J. D., STINNESBECK, W., KELLER, G., ADATTE, T. & HEIDE, K. 2002. Two anomalies of platinum group elements above the Cretaceous-Tertiary boundary at Beloc, Haiti: geochemical context and consequences for the impact scenario. Geological Society of America, Special Paper 356, 163-88.
84. STUEBEN, D., KRAMAR, U., HARTING, M., STINNESBECK, W. & KELLER, G. 2005. High-resolution geochemical record of Cretaceous-Tertiary boundary sections in Mexico: new constraints in the K/T and Chicxulub events. Geochimica et Cosmochimica Acta 69, 2559-79.
85. TANTAWY, A. A. 2003. Calcareous nannofossil biostratigraphy and paleoecology of the Cretaceous-Tertiary transition in the western desert of Egypt. Marine Micropaleontology 47, 323-56.
86. THIBAULT, N. & GARDIN, S. 2006. Maastrichtian calcareous nannofossil biostratigraphy and paleoecology in the Equatorial Atlantic (Demerara Rise, ODP Leg 207 Hole 1258A). Revue de Micropaléontology 49, 199-214.
87. WATKINS, D. K. & SELF-TRAIL, J. M. 2005. Calcareous nannofossil evidence for the existence of the Gulf Stream during the late Maastrichtian. Paleoceanography 20, PA3006.
88. ZACHOS, J. C., ARTHUR, M. A. & DEAN, W. E. 1989. Geochemical evidence for suppression of pelagic marine productivity at the Cretaceous/Tertiary boundary. Nature 337, 61-4.