Benthic foraminiferal ecomarker species of the terminal Cretaceous (late Maastrichtian) deep-sea Tethys

Author(s): Widmark, Joen G. V.; Speijer, Robert P.
Author Affiliation(s): Primary:
Goteborg University, Earth Sciences Centre, Department of Marine Geology, P.O. Box 7064, Goteborg, Sweden
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, 31(3-4), p.135-155. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. 99 refs.; illus., incl. 3 tables, 1 plate
Summary: Benthic foraminiferal distribution patterns throughout the late Maastrichtian Tethyan deep sea are analyzed. Many species are ubiquitously distributed throughout this region and therefore it is hard to assess their ecological preferences. However, five species show distribution patterns, which suggest that they may have distinctive paleoenvironmental preferences. These preferences are interpreted from hypothesized surface circulation and upwelling patterns. Additional information comes from Recent benthic foraminiferal ecology and from responses to the Cretaceous/Paleogene (K/Pg) boundary event. This enables us to assess the ecological preferences of these late Maastrichtian taxa, and establish them as ecological-marker (ecomarker) species for paleoenvironmental interpretation of the late Maastrichtian bathyal-abyssal Tethyan realm. (1) Eouvigerina subsculptura is suggested to be indicative of reasonably oxygenated upper-middle bathyal environments, though with high abundance of utilizable organic matter. (2) Sliteria varsoviensis is linked to areas of late Maastrichtian upwelling and seems to have been an epibenthic species with an opportunistic life mode. (3) Gavelinella beccariiformis and (4) Nuttallides truempyi are considered to be indicative of oligotrophic conditions unless they occur with a large proportion of endobenthic morphotypes. (5) Gavelinella pertusa is proposed to indicate neritic-middle bathyal environments of the "boreal" realm, which might be influenced by more seasonal food-fluxes and by higher oxygen levels than similar settings in the (sub)tropics. Finally, the anomalous high abundances of the buliminid species Sitella cf. plana in deep open ocean environments is discussed in terms of possible mechanisms permitting such a (morphologically) opportunistic species to thrive in such an assumedly oligotrophic environment. Abstract Copyright (1997) Elsevier, B.V.
Year of Publication: 1997
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Aerobic environment; Africa; Asia; Atlantic Ocean; Benthic taxa; Biogeography; Cretaceous; Deep Sea Drilling Project; Deep-sea environment; Egypt; El Kef Tunisia; Europe; Foraminifera; Iberian Peninsula; Index fossils; Invertebrata; Israel; Maestrichtian; Marine environment; Mesozoic; Microfossils; Middle East; North Africa; North Atlantic; Nutrients; Oxygen; Paleo-oceanography; Paleobathymetry; Paleocurrents; Paleoecology; Protista; Senonian; Southern Europe; Spain; Tethys; Tunisia; Upper Cretaceous; Upper Maestrichtian; Upwelling
Record ID: 1997068988
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands

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