Keywords: 121-756C; biostratigraphy; Braarudosphaera spp.; Bramletteius serraculoides; Calcareous nannofossils; Calculated; Chiasmolithus altus; Chiasmolithus cf. oamaruensis; Chiasmolithus oamaruensis; Chiasmolithus spp.; Clausicoccus fenestratus; Clausicoccus spp.; Clausicoccus subdistichus; Coccolithus cachaoi; Coccolithus eopelagicus; Coccolithus miopelagicus; Coccolithus pelagicus; Coronocyclus nitescens; Cyclicargolithus floridanus; DEPTH, sediment/rock; Dictyococcites aff. bisectus; Dictyococcites bisectus; Dictyococcites filewiczii; Dictyococcites hesslandii; Dictyococcites spp.; Discoaster barbadiensis; Discoaster deflandrei; Discoaster distinctus; Discoaster robustus; Discoaster saipanensis; Discoaster spp.; Discoaster tanii; Discoaster tanii nodifer; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eocene-Oligocene Transition; Ericsonia formosa; Helicosphaera compacta; Helicosphaera euphratis; Helicosphaera spp.; IODP Depth Scale Terminology; Isthmolithus recurvus; Joides Resolution; Lanternithus minutus; Leg121; Markalius spp.; Nannofossils indeterminata; ODP Hole 756C; paleoecology; Pontosphaera spp.; Reticulofenestra daviesii; Reticulofenestra spp.; Reticulofenestra umbilicus; Reworked; Sample code/label; Sample ID; South Indian Ridge, South Indian Ocean; Sphenolithus akropodus; Sphenolithus cf. spiniger; Sphenolithus distentus; Sphenolithus intercalaris; Sphenolithus moriformis; Sphenolithus predistentus; Sphenolithus radians; Sphenolithus spp.; Sphenolithus tribulosus; Thoracosphaera spp.; Umbilicosphaera spp.; Zygrhablithus bijugatus