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. The Rashrashiyah Formation of the Sirhan Basin in northern SaudiArabia contains diverse assemblages of planktonic foraminifera. We examinedthe biostratigraphy, stratigraphic range and preservation of upper Eoceneplanktonic foraminifera. Assemblages are well-preserved and diverse, with40 species and 11 genera. All samples are assigned to the PriabonianGlobigerinatheka semiinvoluta Highest Occurrence Zone (E14), consistent with calcareous nannofossilbiostratigraphy indicating Zone CNE17. Well-preserved planktonicforaminifera assemblages from the lower part of the upper Eocene are rareworldwide. Our study provides new insights into the stratigraphic ranges ofmany species. We find older (Zone E14) stratigraphic occurrences of severalspecies of Globoturborotalita previously thought to have evolved in the latest Eocene (ZoneE15, E16) or Oligocene; these include G. barbula, G. cancellata, G. gnaucki, G. pseudopraebulloides, and G. paracancellata. Older stratigraphicoccurrences for Dentoglobigerina taci and Subbotina projecta are also found, and Globigerinatheka kugleri occurs at a younger stratigraphiclevel than previously proposed. Our revisions to stratigraphic rangesindicate that the late Eocene had a higher tropical–subtropical diversity ofplanktonic foraminifera than hitherto reported.

Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges