Diversity of abyssal agglutinated foraminifera from Cenomanian to Santonian sediments of the North Atlantic, supplement to: Kuhnt, Wolfgang (1992): Abyssal recolonization by benthic foraminifera after the Cenomanian/Turonian boundary anoxic event in the North Atlantic. Marine Micropaleontology, 19(3), 257-274


Benthic foraminiferal assemblages of distinctive taxonomic composition occur at the top of benthic fossil-free black shales which correspond to the anoxic event at the Cenomanian/Turonian boundary in the North Atlantic abyssal DSDP/ODP sites 386, 398, 603 and 641. These assemblages consist of minute, thin-walled agglutinated foraminifera with low specific diversity of 2 to 4 species, variable abundance and dominance of few taxa (Haplophragmoides, Rhizammina and Glomospira). The species are inferred to be opportunistic, able to survive in low-oxygen environments and to be pioneers recolonizing the seafloor after cessation of bottom-water anoxia. Most species are characterized by test morphologies with high surface/volume ratios and single-layered wall structures, with loosely agglutinated grains, and small amounts of organic cement for agglutination. These features are best observed in material from ODP Hole 641A which has exceptional foraminiferai preservation because of its shallow burial depth. The successive appearance of benthic foraminifera after the anoxic event is probably controlled by the continuous reoccurrence of more oxygenated bottom- and interstitial-water conditions. With the final development of oxic bottom-water conditions in the Turonian, a rapid radiation of deep-water agglutinated foraminifera occurred in the North Atlantic.

DOI https://doi.org/10.1594/PANGAEA.690409
Related Identifier https://doi.org/10.1016/0377-8398(92)90032-F
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.690409
Creator Kuhnt, Wolfgang
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1992
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (-70.028W, 31.187S, -10.718E, 42.155N); North Atlantic Ocean; North Atlantic/CONT RISE; North Atlantic/SEAMOUNT
Temporal Coverage Begin 1975-07-24T00:00:00Z
Temporal Coverage End 1985-06-10T14:30:00Z