Abundance of calcareous nannofossils across the K/T boundary at ODP Hole 113-690C (Table 1) ...

A biostratigraphically continuous, but intensely bioturbated, Cretaceous/Tertiary boundary sequence was cored during Ocean Drilling Program (ODP) Leg 113 on Maud Rise (65°S) in the Weddell Sea off East Antarctica. This interval is the first recovered by ODP/DSDP in the South Atlantic sector of the S...

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Bibliographic Details
Main Authors: Pospichal, James J, Wise, Sherwood W
Format: Dataset
Language:English
Published: PANGAEA 1990
Subjects:
Epoch
Nannofossil zone
Sample code/label
DEPTH, sediment/rock
Biantholithus sparsus
Cruciplacolithus primus
Hornibrookina edwardsii
Biscutum castrorum
Cyclagelosphaera reinhardtii
Lapideacassis sp.
Markalius inversus
Neocrepidolithus spp.
Thoracosphaera spp.
Zygodiscus sigmoides
Acuturris scotus
Ahmuellerella octoradiata
Arkhangelskiella spp.
Chiastozygus sp.
Cretarhabdus conicus
Cribrosphaerella daniae
Cribrosphaerella ehrenbergii
Eiffellithus turriseiffelii
Gartnerago spp.
Kamptnerius magnificus
Micula decussata
Nephrolithus frequens
Prediscosphaera cretacea
Prediscosphaera spinosa
Prediscosphaera stoveri
Nannofossils, tertiary
Nannofossils, survivor
Nannofossils, cretaceous
Nannofossils
Drilling/drill rig
DSDP/ODP/IODP sample designation
Smear slide analysis
Leg113
Joides Resolution
Ocean Drilling Program ODP
Antarc*
Antarctica
East Antarctica
Southern Ocean
Weddell Sea
Online Access:https://dx.doi.org/10.1594/pangaea.746448
https://doi.pangaea.de/10.1594/PANGAEA.746448
Description
Summary:A biostratigraphically continuous, but intensely bioturbated, Cretaceous/Tertiary boundary sequence was cored during Ocean Drilling Program (ODP) Leg 113 on Maud Rise (65°S) in the Weddell Sea off East Antarctica. This interval is the first recovered by ODP/DSDP in the South Atlantic sector of the Southern Ocean and offers a unique opportunity to study the nannofossil sequences leading up to and beyond the terminal Cretaceous event at a high southern latitude.The K/T boundary lies just within Chron 29R and is placed at ODP Sample 113-690C-15X-4, 41.5 cm. An iridium anomaly was independently noted at about this level as well. Upper Maestrichtian-lower Paleocene sediments consist mostly of light-colored nannofossil chalks. Dark brown sediments at the base of the Danian (Zone CPla) are characterized by an increased clay content attributed to a drop in calcareous microplankton productivity following the terminal Cretaceous event.Although delineation of the boundary is hampered by intense bioturbation, the sharp ... : <1 = present, but not noted within count of 500 specimens. ...

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