Biostratigraphy and Mass Extinction Pattern across the Cretaceous/Paleogene Boundary, Northern Alborz, Iran


High resolution sampling across the Cretaceous/Paleogene boundary (K/Pg) at the Galanderud section in northern Iran provides the most expanded and continuous section for us to consider biostratigraphy and the mass extinction pattern of Cretaceous planktic foraminifera. Based on planktic foraminifera, four biozones and five sub-biozones have been identified across the K/Pg boundary. These biozones include the Abathomphalus mayaroensis Biozone (Plummerita hantkeninoides subbiozone), the Guembelitria cretacea Biozone (including two sub-biozones: the Hedbergella holmdelensis and the Parvularugoglobigerina longiapertura), the Parvularugoglobigerina eugubina Biozone (including two subbiozones: the Parvularugoglobigerina Sabina and the Eoglobigerina simplicissima) and finely the Parasubbotina pseudobulloides Biozone. Planktic foraminiferal extinction occurred over a brief period, with 3% of the species disappearing in the late Maastrichtian, and 72% of the species becaming extinct at the K/Pg boundary. About 25% of the species survived into the early Danian. Extinction of 73% of the species at the K/Pg boundary is very compatible with the effect of a large asteroid impact.

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M. Asgharian Rostami, M. Vahidinia, E. Ghasemi-Nejad and A. Sadeghi, "Biostratigraphy and Mass Extinction Pattern across the Cretaceous/Paleogene Boundary, Northern Alborz, Iran," Open Journal of Geology, Vol. 3 No. 1, 2013, pp. 33-38. doi: 10.4236/ojg.2013.31005.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] G. Keller, P. K. Bhowmick, H. Upaidhyay, A. Dave, A. N. Reddy, B. C. Jaiprakash and T. Adatte, “Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary (KTB) Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin,” Journal of the Geological Society of India, Vol. 78, No. 5, 2011, pp. 399-428.
[2] L. W. Alvarez, W. Alvarez, F. Asaro and H. V. Michel, “Extraterrestrial Cause for the Cretaceous-Tertiary Extinction,” Science, Vol. 208, No. 4448, 1980, pp. 1195-1108. doi:10.1126/science.208.4448.1095
[3] V. Courtillot, J. Besse, D. Vandamme, R. Montigny, J.-J. Jaeger and H. Cappetta, “Deccan Flood Basalts at the Cretaceous/Tertiary Boundary?” Earth and Planetary Science Letters, Vol. 80, No. 3-4, 1986, pp. 361-374. doi:10.1016/0012-821X(86)90118-4
[4] H. P. Luterbacher and I. Premoli-Silva, “Biostratigrafia del Limite Cretaceo-Terziario nell’Appennino Centrale,” Rivista Italiana di Paleontologia, Vol. 70, No. 1, 1964, pp. 67-117.
[5] E. Molina, I. Arenillas and J. A. Arz, “The Cretaceous/ Tertiary Boundary Mass Extinction in Planktic Foraminifera at Agost, (Spain),” Revue de Micropaléontologie, Vol. 39, No. 3, 1996, pp. 225-243. doi:10.1016/S0035-1598(96)90075-6
[6] E. Molina, L. Alegret, I. Arenillas and J. A. Arz, “The Cretaceous/Paleogene Boundary at the Agost Section Revisited: Paleoenvironmental Reconstruction and Mass Extinction Pattern,” Journal of Iberian Geology, Vol. 31, No. 1, 2005, pp. 135-148.
[7] M. Alavi, “Tectonostratigraphic Synthesis and Structural Style of the Alborz Mountain System in Northern Iran,” Journal of Geodynamics, Vol. 21, No. 1, 1996, pp. 1-33. doi:10.1016/0264-3707(95)00009-7
[8] J. I. Canudo, G. Keller and E. Molina, “Cretaceous/Tertiary Extinction Pattern and Faunal Turnover at Agost and Caravaca, S.E. Spain,” Marine Micropaleontology, Vol. 17, No. 3-4, 1991, pp. 319-341. doi:10.1016/0377-8398(91)90019-3
[9] 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, 1996, pp. 221-254. doi:10.1016/0031-0182(95)00009-7
[10] I. Arenillas, J. A. Arz, E. Molina and C. Dupuis, “The Cretaceous/Paleogene (K/P) Boundary at Ain Settara, Tunisia: Sudden Catastrophic Mass Extinction in Planktic Foraminifera,” The Journal of Foraminiferal Research, Vol. 30, No. 3, 2000, pp. 202-218. doi:10.2113/0300202
[11] 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, 2004, pp. 79-95. doi:10.1080/00241160310005097
[12] P. Bronnimann, “Trinidad Paleocene and Lower Eocene Globigerinidae,” Bulletin of American Paleont, Vol. 34 No. 143, 1952, pp. 1-34.
[13] J. Smit, “Extinction and Evolution of Planktonic Foraminifera after a Major Impact at the Cretaceous/Tertiary Boundary,” Special Paper—Geological Society of America, Vol. 190, 1982, pp. 359-372.
[14] R. K. Olsson, C. Hemleben, W. A. Berggren and B. T. Huber, “Atlas of Paleocene Planktonic Foraminifera,” Smithsonian Contributions to Paleobiology, Vol. 85, No. 85, 1999, pp. 1-252.
[15] 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, 2005, pp. 279-298. doi:10.2113/35.4.279
[16] G. P. Leonov and V. P. Alimarina, “Problems on the Boundary between the Cretaceous and Paleogene Systems. Moscow,” University Geology Faculty Sbornik Trudov, 1962, pp. 29-60.
[17] 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 Societé géologique de France, Vol. 169, No. 3, 1998, pp. 351-363.
[18] 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, 2002, pp. 233-255. doi:10.1016/S0031-0182(01)00398-4
[19] 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, 2009, pp. 196-209. doi:10.1016/j.marmicro.2009.05.001

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