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Alegret, Ortiz & Kaminski (eds.), 2012. Ninth International Workshop on Agglutinated Foraminifera, Abstract Volume Kuhnt, W. & Collins, E.S. 1996. Cretaceous to Paleogene benthic foraminifers from the Iberia Abyssal Plain, in Whitmarsh, R. B., Sawyer, D. S., Klaus, A. and Masson, D. G. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results 149: College Station, TX (ODP), 203-216. Morgiel, J. & Olszewska, B. 1981. Biostratigraphy of the Polish external Carpathians based on agglutinated foraminifera. Micropaleontology, 27, 1-24. Thomas, E. 2007. Cenozoic Mass Extinctions in the Deep Sea; What Disturbs the Largest Habitat on Earth?, in Monechi, S., Coccioni, R. & Rampino, M.R. (eds.) Mass Extinctions and Other Large Ecosystem Perturbations: Extraterrestrial and Terrestrial Causes. Geological Society of America Special Paper, 424, 1-23. 11
Alegret, Ortiz & Kaminski (eds.), 2012. Ninth International Workshop on Agglutinated Foraminifera, Abstract Volume Agglutinated benthic foraminifera and changes of paleoenvironment conditions across the Cretaceous-Paleogene boundary in the Galanderud section, Alborz basin, North of Iran Masoud ASGHARIAN ROSTAMI 1 and Mohammad VAHIDINIA 1 1 Department of Earth Science, Faculty of Science, Ferdowsi university of Mashhad, Mashhad, Iran. e-mail:masood.rostami@yahoo.com <strong>The</strong> Galanderud section has been studied for quantitative changes in agglutinated benthic foraminifera. Twenty-five species were recognized in the uppermost Maastrichtian marl and in the K-P boundary clay layer. Three types of assemblages are: 1- Uppermost Maastrichtian assemblages are dominated by calcareous agglutinated wall such as Spiroplectammina, Dorothia, Gaudryina and Recurvoides. 2- At this assemblage there has been a drastic decrease in diversity of agglutinated benthic foraminifera within the boundary clay and epifaunal species including Cibicidoides, Anomalinoides and infaunal species of Tappanina spp. are dominated at this boundary. 3- In the lower Danian some species such as Dorothia, Gaudryina and Spiroplectammina were recovered, although they are low percent. Regarding the quantitative benthic foraminifera a mesotrophic or relatively eutrophic condition at uppermost Maastrichtan and drastic decrease in surface productivity, collapse of food web and low oxygen condition at the K-P boundary was recognized. <strong>The</strong> benthic foraminiferal assemblages slowly recover at early Danian, which indicates that surface productivy gradually increased in the early Danian. References: Alegret, L., Kaminski, M.A. & Molina, E. 2004. Paleoenvironmental recovery after the Cretaceous/Paleogene boundary crisis: Evidence from the marine Bidart Section (SW France). Palaios, 19, 574-586. Bolli, H.M., Saunders, J.B. & Beckman J.P. 1994. Benthic Foraminifera Biostratigraphy Caribbean, of the Southern Cambridge University press, 300 pp. Kuhnt, W. & Kaminski, M.A. 1993. Changes in the community structure of deep-water agglutinated foraminifers across the K/T boundary in the Basque Basin (northern Spain). Revista Española de Micropaleontología, 25, 57-92. 12
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