Shamrock, Jamie L. and Watkins, David K. (2012): Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)
Leg/Site/Hole:
Related Expeditions:
ODP 122
Identifier:
ID:
2013-020742
Type:
georefid
Creator:
Name:
Shamrock, Jamie L.
Affiliation:
University of Nebraska-Lincoln, Department of Geosciences, Lincoln, NE, United States
Role:
author
Name:
Watkins, David K.
Affiliation:
Role:
author
Identification:
Title:
Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)
Year:
2012
Source:
Stratigraphy
Publisher:
Micropaleontology Press, New York, NY, United States
Volume:
9
Issue:
1
Pages:
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.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-19.5314 West:112.1514 East:
112.1515 South:-19.5315
Keywords: Stratigraphy; Isotope geochemistry; algae; assemblages; biostratigraphy; biozones; C-13/C-12; Calcidiscus ellipticus; carbon; Cenozoic; chemostratigraphy; communities; Cruciplacolithus; Cyclicargolithus parvus; Eocene; Exmouth Plateau; Hayella situliformis ovata; Hexadelus archus; Indian Ocean; isotope ratios; isotopes; Leg 122; marine environment; Markalius latus; microfossils; morphology; nannofossils; new taxa; O-18/O-16; Ocean Drilling Program; ODP Site 762; oxygen; paleo-oceanography; Paleocene-Eocene Thermal Maximum; paleoclimatology; paleoecology; paleoenvironment; Paleogene; Pedinocyclus annulus; Plantae; stable isotopes; taxonomy; Tertiary;
.