Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary

Micropalaeontological dating of the Prémontré mammal fauna (MP10, Prémontré Sands, EECO, early late Ypresian, Paris Basin)

“…Martini's (1971) standard Paleogene calcareous nannofossil zonation (traditionally abbreviated to NP zones) and the high-resolution high latitude zonation of Steurbaut (1998) are applied here. The taxonomy is essentially from Perch-Nielsen (1985), taking into account subsequent modifications by Young & Bown (1997), Aubry &Bord (2009) andSteurbaut (2011). The nannofossil samples, residues and slides are stored in the collections of the RBINS (Brussels, Belgium).…”

Bipolar Atlantic deepwater circulation in the middle-late Eocene: Effects of Southern Ocean gateway openings

“…Sediment drift accumulation in the North Atlantic and Pacific Oceans [e.g., Wold , ; Kerr et al ., ], the presence of hiatuses in the North Atlantic and Southern Ocean [ Miller and Tucholke , ; Mountain and Miller , ; Wright and Miller , , ], and Ɛ Nd data from the Southern Ocean and South Atlantic [ Scher and Martin , , ] in the late Eocene‐early Oligocene indicate changes in deep ocean circulation. Microfossil communities also indicate circulation change and nutrient reorganization beginning in the late‐middle Eocene: benthic foraminifera experienced stepwise extinctions and originations of new species in the late Eocene through early Oligocene [e.g., Miller et al ., ; Thomas , ] with an increase in species that thrive in high levels of phytodetritus [ Thomas and Gooday , ], while calcareous nannoplankton experienced a similar series of extinctions and originations that likely reflect changes in surface ocean nutrient distribution [ Aubry and Bord , ].…”

Success and failure in Cenozoic global correlations using golden spikes: A geochemical and magnetostratigraphic perspective

“…O (Savin et al, 1975;Kennett and Shackleton, 1977) and δ 1 3 C values (Zachos et al, 1996) were also uncertain. A purported mass extinction event at or near the E/O boundary (Raup and Sepkoski, 1982) turned out to be an artifact of a slower, protracted turnover in marine organisms (e.g., Aubry and Bord, 2009), yet the Eocene-Oligocene transition (EOT) remains one of the most important oceanographic and sea-level events of the Cenozoic (e.g., Miller et al, 1991;Zachos et al, 1992Zachos et al, , 2001Katz et al, 2008;Cramer et al, 2009). However, the E/O and EOT are not the same, with the stepwise EOT beginning before the boundary and the major δ O maximum (Miller et al, 1991) postdating the boundary by over 0.1 Myr ( Fig.…”