Inthisstudy,anUpperCretaceoussedimentarysequenceintheAnaranAnticline(locatedinthecentralZagros)isinvestigatedtoassessplanktonicforaminiferalbiozonationsandimplicationsforsealevelchanges.Thethicknessofthissequenceisabout215 m, characterized by shales and limestones with thin marly limestone intercalations. In total, 51 species and 22 genera of planktonic foraminifera in 12 biozones spanning the middle Campanian to late Danian ages were delineated in the studied sequence. Additionally, planktonicforaminiferalmorphologicalmodels,speciesabundancepercentages,andtheplanktonic/benthonicforaminiferalratio(P/B) ratioswereassessedtoreconstructchangesinsealevel.ThestatisticalstudiesonthedifferentgeneraandspeciesandtheP/Bratiofrom the base to the top of the sequence indicate sea level transgressions during the middle Campanian and Maastrichtian in the Contusotruncana plummerae Interval Zone, Radotruncana calcarata Total Range Zone, Globotruncanella havanensis Partial Range Zone, GlobotruncanaaegyptiacaIntervalZone,ContusotruncanacontusaIntervalZone,andpartoftheAbathomphalusmayaroensisInterval Zone. Moreover, speciesbelonging to the deep-watermorphotype (G. arca, G. hilli, G. linneiana, andG. ventricosa)aremostlypresent. Furthermore, two intervals of this sequence are associated with falling sea levels: 1) at the Campanian/Maastrichtian boundary in the middleoftheGansserina gansseribiozone;2)fromthelateMaastrichtianclosetotheCretaceous/Paleogeneboundarywithmarlylithology.

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