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Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)

Jamie L. Shamrock and David K. Watkins
Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)
Stratigraphy (2012) 9 (1): 1-54

Abstract

A relatively complete section of Eocene ( approximately 33.9-55.8 Ma) pelagic chalk from offshore northwestern Australia was used to analyze range and abundance data of approximately 250 Eocene species to test the efficacy of the existing CP (Okada and Bukry 1980) and NP (Martini 1971) biostratigraphic zonation schemes. Changes in nannofossil diversity, abundance, and community structure were monitored through several Eocene paleoenvironmental events, as identified by changes in delta (super 13) C and delta (super 18) O data, to examine variations in surface water conditions. Major changes in nannofossil assemblages, as indicated by dominance crossovers, correspond to paleoenvironmental shifts such as the PETM (Paleocene-Eocene thermal maximum) and the EECO (Early Eocene climatic optimum). This research also provides systematic paleontology and range data for one new genus (Hexadelus) and eight new species or variants (Calcidiscus ellipticus, Cruciplacolithus nebulosus, Cruciplacolithus opacus, Cyclicargolithus parvus, Hexadelus archus, Hayella situliformis var. ovata, Markalius latus, Pedinocyclus annulus) and addresses several taxonomic issues in other Eocene species.


ISSN: 1547-139X
Serial Title: Stratigraphy
Serial Volume: 9
Serial Issue: 1
Title: Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)
Affiliation: University of Nebraska-Lincoln, Department of Geosciences, Lincoln, NE, United States
Pages: 1-54
Published: 2012
Text Language: English
Publisher: Micropaleontology Press, New York, NY, United States
References: 103
Accession Number: 2013-020742
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 10 plates, 7 tables, geol. sketch map
S19°53'15" - S19°53'14", E112°15'14" - E112°15'15"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201314
Program Name: ODPOcean Drilling Program
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