Distribution of calcareous nannofossils in Cretaceous to Paleogene sediments of ODP Hole 208-1262C at Walvis Ridge, South Atlantic Ocean (Appendix A), supplement to: Bernaola, Gilen; Monechi, Simonetta (2007): Calcareous nannofossil extinction and survivorship across the Cretaceous-Paleogene boundary at Walvis Ridge (ODP Hole 1262C, South Atlantic Ocean). Palaeogeography, Palaeoclimatology, Palaeoecology, 255(1-2), 132-156

• Main Authors: Bernaola, Gilen, Monechi, Simonetta
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2007
• Subjects: DEPTH, sediment/rock; Sample code/label; Nannofossils; Acuturris scotus; Ahmuellerella regularis; Arkhangelskiella cymbiformis; Broinsonia spp.; Calculites spp.; Ceratolithoides aculeus; Ceratolithoides kamptneri; Chiastozygus amphipons; Chiastozygus fessus; Chiastozygus litterarius; Corollithion exiguum; Corollithion kennedyi; Corollithion madagaskarensis; Cretarhabdus conicus; Cribrocorona gallica; Cribrosphaerella ehrenbergii; Cylindralithus cf. nudus; Cylindralithus serratus; Discorhabdus ignotus; Eiffellithus eximius; Eiffellithus gorkae; Eiffellithus parallelus; Eiffellithus turriseiffelii; Kamptnerius magnificus; Lithraphidites carniolensis; Lithraphidites praequadratus; Lithraphidites quadratus; Loxolithus armilla; Manivitella pemmatoidea; Microrhabdulus attenuatus; Microrhabdulus belgicus; Microrhabdulus cf. undosus; Microrhabdulus decoratus; Micula concava; Micula decussata; Micula murus; Micula prinsii; Micula spp.; Micula swastica; Nephrolithus frequens; Prediscosphaera spp.; Prediscosphaera cretacea; Prediscosphaera grandis; Prediscosphaera honjoi; Prediscosphaera intercisa; Prediscosphaera majungae; Prediscosphaera spinosa; Prediscosphaera stoveri; Pseudomicula quadrata; Quadrum bengalensis; Quadrum gartneri; Quadrum sissinghii; Retecapsa angustiforata; Retecapsa crenulata; Retecapsa ficula; Retecapsa schizobrachiata; Retecapsa surirella; Rhagodiscus angustus; Rhagodiscus reniformis; Rhagodiscus splendens; Rhombolithion rhombicus; Rotelapillus munitus; Rotelapillus sp.; Staurolithites laffittei; Staurolithites mielnicensis; Stoverius cf. coangustatus; Tetrapodorhabdus decorus; Tranolithus minimus; Vekshinella crux; Watznaueria barnesae; Watznaueria biporta; Watznaueria fossacincta; Watznaueria manivitiae; Zeugrhabdotus embergeri; Zeugrhabdotus sp.; Zeugrhabdotus spiralis; Biscutum castrorum; Biscutum constans; Braarudospharea bigelowii; Cruciplacolithus primus; Cyclagelosphaera reinhardtii; Cyclagelosphaera sp.; Goniolithus fluckigeri; Lapideacassis spp.; Markalius apertus; Markalius inversus; Markalius walvisensis; Neobiscutum cf. romeinii; Neobiscutum parvulum; Octolithus multiplus; Zeugrhabdotus sigmoides; Thoracosphaera operculata; Thoracosphaera saxea; Biantholithus sparsus; Cyclagelosphaera alta; Neocrepidolithus spp.; Neochiastozygus sp.; Neocrepidolithus cruciatus; Neocrepidolitus fossus; Biscutum sp.; Futyania petalosa; Chiastozygus ultimus; Holococcolithus sp.; Biantholithus hughesii; Neocrepidolithus neocrassus; Cyclolithella spp.; Neocrepidolithus sp.; Ericsonia cf. subpertusa; Neochiastozygus primitivus; Hornibrookina apellanizii; Coccolithus cf. pelagicus; Praeprinsius cf. tenuiculum; Thoracosphaera sp.; Neochiastozygus modestus; Cruciplacolithus zachosii; Cruciplacolithus cf. intermedius; Drilling/drill rig; DSDP/ODP/IODP sample designation; Smear slide analysis; Leg208; Joides Resolution; Ocean Drilling Program ODP; Alta; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.693626; https://doi.pangaea.de/10.1594/PANGAEA.693626

Site 1262 in the South Atlantic Ocean has provided a stratigraphically continuous deep Cretaceous/Paleogene boundary sequence. High resolution calcareous nannofossil quantitative analyses were carried out across the K/P boundary, and provided a remarkable record of the abrupt and catastrophic extinction. The calcareous nannofossil assemblages are abundant and well preserved allowing to obtain a precise bioevent sequence and to document in detail the survivors and victims and the subsequent recovery across the K/P boundary.Late Maastrichtian diversity and absolute abundance is high and no decrease towards the boundary has been observed. The relative abundance of Cretaceous species does not suffer important changes during the latest Maastrichtian. However, the increase in abundance of cool-water taxa, paralleled with a decrease of warm water taxa in the uppermost 2 cm of the Maastrichtian, revealed a pulse of surface water cooling.The K/P boundary is marked by an important decrease in calcareous nannofossil absolute abundance, the increase of Cretaceous-persistent species such as Cyclagelosphaera reinhardtii together with the dinoflagellate cysts of Thoracosphaera operculata and the appearance of the new-Paleocene taxa Cyclagelosphaera alta and Biantholithus sparsus. These events are followed by the successive relative abundance increases of other Cretaceous survivors as Zeugrhabdotus sigmoides, Markalius inversus and Biscutum recognized as r-selected taxa, adapted to eutrophic and cold water environments. In the early Danian several first occurrences of small new-Paleocene species have been observed: calcareous nannoplankton evolutionary attempts to colonize vacant niches left by the extinct Cretaceous species. Only some forms succeed and become ancestors to the Cenozoic assemblages - the other disappear in few kiloyear. The presence of a reworking/mixing interval above the K/P boundary hampered to unequivocally interpret if the few Cretaceous-vanishing taxa may have survived for a very short time after the K/P extinction. : <1 = present