Paleobiogeography of Campanian-Maastrichtian foraminifera in southern high latitudes

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doi: 10.1016/0031-0182(92)90090-R
Author(s): Huber, Brian T.
Author Affiliation(s): Primary:
Smithson. Inst., Natl. Mus. Nat. Hist., Washington, DC, United States
Other:
Univ. Heidelberg, Federal Republic of Germany
Volume Title: Biogeographic patterns in the Cretaceous ocean
Volume Author(s): Malmgren, Bjorn A., editor; Bengtson, P.
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 92(3), p.325-360; 5th biennial meeting of the European Union of Geosciences Symposium on Biogeographic patterns in the Cretaceous ocean, Strasbourg, France, March 20-23, 1989, edited by Bjorn A. Malmgren and P. Bengtson. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 145 refs.; illus. incl. charts, 4 tables, sketch maps
Summary: Poleward changes in the diversity of total and keeled planktonic species of the Southern Hemisphere are compared for the early and late Campanian and early and late Maastrichtian. Latitudinal diversity gradients were weakest during the early Campanian and more pronounced during the late Campanian and Maastrichtian. Shallow marine seaways within West Antarctica are suggested by similarity of Late Cretaceous nearshore benthic and open ocean planktonic assemblages from southern high-latitude land and drill sites, and by the occurrence of recycled Cretaceous marine microfossils from antarctic interior and continental margin localities. Development of a major water mass boundary between cool surface waters south of about 50S paleolatitude and warmer surface waters to the north in the South Atlantic and Indian Ocean may have caused biogeographic isolation of Austral Realm assemblages during the late Campanian and early Maastrichtian time. The distribution of A. mayaroensis is in agreement with isotopic evidence for late Maastrichtian climatic cooling, while that of P. elegans correlates with a latest Maastrichtian warming event (about 66.8-66.6 Ma). Delayed first occurrences of the other taxa cannot be explained by paleoclimatic factors alone; variations in global eustatic sea-level and orogeny between southern South America and West Antarctica may have also influenced the taxonomic composition of southern high-latitude foraminiferal assemblages. (Auth. mod.)
Year of Publication: 1992
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctica; Assemblages; Benthic taxa; Biogeography; Campanian; Cretaceous; Deep Sea Drilling Project; Distribution; Foraminifera; Invertebrata; Maestrichtian; Mesozoic; Microfossils; Occurrence; Ocean Drilling Program; Ocean circulation; Paleoclimatology; Planktonic taxa; Polar regions; Protista; Senonian; Southern Hemisphere; Species diversity; Stratigraphy; Upper Cretaceous
Record ID: 1992056205
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

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