Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic ...

• Main Authors: Alegret, Laia, Thomas, Ellen
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: DEPTH, sediment/rock; Sample code/label; Ammodiscus sp.; Arenobulimina truncata; Caudammina ovula; Clavulinoides amorpha; Clavulinoides sp.; Dorothia bulletta; Dorothia trochoides; Dorothia spp.; Gaudryina pyramidata; Gaudryina spp.; Glomospira sp.; Glomospirella grzybowskii; Repmanina charoides; Hyperammina sp.; Marssonella oxycona; Marssonella sp.; Marssonella indentata; Paratrochamminoides sp.; Recurvoides sp.; Reophax sp.; Rhizammina sp.; Rzehakina sp.; Saccammina sp.; Spirillina sp.; Spiroplectammina cf. dentata; Spiroplectammina cf. laevis; Spiroplectammina spp.; Spiroplectammina cf. israelskyi; Spiroplectammina spectabilis; Trochamminoides sp.; Vulvulina sp.; Alabamina creta; Alabamina sp.; Allomorphina velascoensis; Angulogavelinella avnimelechi; Anomalinoides affinis; Anomalinoides ammonoides; Anomalinoides sp.; Anomalinoides spp.; Aragonia velascoensis; Astacolus spp.; Bolivina cf. huneri; Bolivinoides decoratus; Bolivinoides delicatulus; Buchnerina sp.; Bulimina spp.; Bulimina cf. alazanensis; Bulimina midwayensis; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.672083; https://doi.pangaea.de/10.1594/PANGAEA.672083

Sediments recovered at ODP Site 1262 on Walvis Ridge (eastern South Atlantic Ocean, paleodepth ~2500–3000 m) offer an opportunity to look into the nature and cause(s) of the benthic foraminiferal turnover across the Cretaceous/Paleogene (K/Pg) boundary at abyssal depths at a location relatively remote from the location of the asteroid impact on the Yucatan peninsula. Late Maastrichtian assemblages were diverse and heterogeneous, reflecting oligo- to mesotrophic conditions at the sea floor. As at other locations, there was no significant extinction of benthic foraminiferal species at the K/Pg boundary, but the diversity and heterogeneity of the assemblages decreased precipitously. The percentage of infaunal buliminid taxa decreased rapidly, but the total percentage of infaunal taxa remained essentially unchanged. Benthic foraminiferal accumulation rates (BFAR) dropped at the boundary itself, and fluctuated strongly later in the Danian. After the K/Pg boundary, opportunistic taxa increased in relative ... : Sediment depth are meters composite depth (mcd) following Zachos et al. (2004) ...