Upper Cretaceous (Turonian–Santonian) Haplophragmoides from IODP site U1512, Great Australian Bight

Author(s)
Erik Wolfgring, Michael A. Kaminski, Anna Waśkowska
Abstract

Results from the International Ocean Discovery Program (IODP) Site U1512 in the Great Australian Bight offer insights into climate immediately after the peak of the Cretaceous hothouse. Lower Turonian to Santonian deposits yield a unique high-resolution micropaleontological record of the Australo-Antarctic Gulf that is dominated by agglutinated foraminifera. The complex paleoenvironment at Site U1512 illustrates a constantly changing marine setting characterized by the interplay of runoff from the vast Ceduna River system to the north and varying degrees of influence of the Indian Ocean. A common element in the agglutinated foraminiferal assemblage is the genus Haplophragmoides, which represents between 20 and 40% of the total benthic foraminiferal assemblage, and its occurrence seems particularly common in intervals with higher terrestrial influx. Like many agglutinated foraminiferal assemblages, the agglutinated taxa at Site U1512 suffer from preservational issues. In addition to effects during early diagenesis, like the degradation of organic cement, the delicate planispiral taxa especially experienced extensive deformation, which can affect the correct identification of taxonomically relevant features. Among the six species of Haplophragmoides that represent most of this genus at Site U1512, we identify and describe three new species: H. petaliformis n.sp., H. tenellulus n.sp., and H. antarcticus n.sp.

Organisation(s)
Department of Palaeontology
External organisation(s)
Università degli Studi di Milano-Bicocca, King Fahd University of Petroleum & Minerals (KFUPM), AGH University of Science and Technology
Journal
Revue de Micropaleontologie
Volume
81
ISSN
0035-1598
DOI
https://doi.org/10.1016/j.revmic.2023.100739
Publication date
07-2023
Peer reviewed
Yes
Austrian Fields of Science 2012
301202 History of pharmacy, 404003 Agricultural and food biotechnology related ethics
Keywords
ASJC Scopus subject areas
Palaeontology
Sustainable Development Goals
SDG 14 - Life Below Water
Portal url
https://ucrisportal.univie.ac.at/en/publications/9ac551b2-0031-4eb5-bc5b-7f5c07d532a5