Late Cretaceous deep-water agglutinated foraminiferal assemblages from the North Atlantic and its marginal seas

Biostratigraphy and Paleoecology of Late Cretaceous Abyssal Agglutinated Foraminifers from the Western Pacific Ocean (Deep Sea Drilling Project Holes 196A and 198A and Ocean Drilling Program Holes 800A and 801A)

“…It is apparent that the lowest diversity assemblages are associated with biosiliceous sediments (e.g., with the radiolarian-rich sediments of Sections 129-801A-7R-3 and 129-801-7R-4), whereas the higher diversity assemblages are from residues with little or no biosiliceous components. Similar relationships were observed between foraminiferal biofacies and sediment type in the North Atlantic, in which the high-and low-diversity assemblages were termed "Biofacies A" and "Biofacies B," respectively (Kuhnt et al, 1989).…”

“…Krasheninnikov (1974) recognized two different assemblages of abyssal agglutinated foraminifers as useful in determining a stratigraphic succession in the Indian Ocean. Recent studies in the North Atlantic Ocean Kuhnt et al, 1989, Kuhnt andMoullade, 1991) and in the western Mediterranean realm (Kuhnt, 1990) have developed local biostratigraphic zonations of Late Cretaceous DWAF for these basins, which extended the zonation used in the Polish and Rumanian external Carpathians (Geroch and Nowak, 1984;Neagu, 1990;Kuhnt et al, in press). …”

Reworked Benthic Foraminifers from Site 802, East Mariana Basin, Western Equatorial Pacific

“…This assemblage is typical of the final stage of distal turbidite sedimentation in which the entrained E layer finally settles out, containing within it the tubular foraminifers that had previously inhabited the nepheloid layer at the sediment/water interface prior to substrate disturbance by the turbidite (Kaminski, 1988). The low diversity and dominance of tubular forms in this assemblage is similar in character to the "Biofacies B" assemblages that developed in the North Atlantic immediately following biosiliceous "events" in the Late Cretaceous (Kuhnt et al, 1989). Although similar Biofacies B assemblages are also seen at Pigafetta Basin Sites 196,198,800, and 801 immediately following radiolarian sedimentation (Wightman and Kuhnt, this volume), there is no evi- …”

“…Study of these assemblages may also strengthen the biostratigraphic zonation already established for the western Pacific Sites 196,198,800,and 801 (Wightman and Kuhnt,this volume), North Atlantic Ocean (Moullade et al, 1988;Kuhnt et al, 1989), and Western Mediterranean realm (Kuhnt, 1990). The reworked shallow-water larger foraminifers are of interest as they document erosional events through the geological history of the East Mariana Basin and provide information on the depositional setting and stratigraphy of the source environments.…”

Magnetobiostratigraphic Synthesis of Leg 123: Sites 765 and 766 (Argo Abyssal Plain and Lower Exmouth Plateau)

“…Leg 123 biostratigraphy of these taxa, some of which may be unique to the abyssal realm, was based on the zonation of Geroch and Nowak (1984). This zonation is based on similar assemblages from the Carpathian flysch basins and has been used successfully for Upper Cretaceous abyssal red clay sediments from DSDP Site 603 and ODP Site 641 in the North Atlantic (Moullade et al, 1988;Kuhnt and Kaminski, 1989). The taxonomy and biostratigraphy of Upper Cretaceous calcareous benthic foraminifers recovered during Leg 123 follow Sliter (1980) and Dailey (1983).…”