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The Atlas of Oligocene Planktonic Foraminifera

The recently published Atlas of Oligocene Planktonic Foraminifera provides a comprehensive reassessment of the taxonomy, evolutionary relationships, stratigraphic distributions, and paleoecology of planktonic foraminifera from the Oligocene Epoch. Our aim was to produce a clear and workable taxonomy that covers all described Oligocene planktonic foraminifera and their synonyms. Our work is founded on new scanning electron micrographs (SEMs) of most of the type specimens and extensive illustration material from all over the globe, including in particular, New Jersey, the Adriatic Sea, Syria, Trinidad, Tanzania and Java, as well as new study of material from the International Ocean Discovery Program (IODP) and its predecessors. We have also included important species of the late Eocene and early Miocene that either complete a lineage or are critical to our understanding of phylogenetic relationships. The higher taxonomy is based on the examination of wall textures, which provides the primary divisions into spinose, nonspinose and microperforate groups. New microstructural observations on the tests of microperforate and medioperforate planktonic foraminifera from the Oligocene have allowed two types and two subtypes of wall texture to be distinguished and described for the first time. Detailed range and phylogenetic charts of all the taxa are presented, and existing geochemical data are synthesized, with the addition of some new stable isotope data. A total of 128 species, of which 14 are new ; and 26 genera, of which 2 are new, are described in the Atlas. New SEM images of the type specimens of over 60 species and their synonyms are shown for the first time in the volume, providing new insight on the shell architecture and wall texture, particularly for species that have previously been poorly illustrated. The resulting plates demonstrate the range in morphologic variability permitted in our refined taxonomic concepts throughout their geographic range and in material with differing preservation styles, allowing us to establish, confirm or dispute synonymies. The Atlas contains over 140 plates, and more than 2000 SEM images and will be invaluable for biostratigraphers, paleontologists, and paleoclimatologists, both in academia and industry, and of importance to all those interested in the fossil record and evolution of life and climate. Future areas for research on Oligocene and early Miocene planktonic foraminifera are also identified.

planktonic foraminifera, taxonomy, biostratigraphy, paleoecology

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