georefid:2013-020742SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2013-020742<gco:CharacterString>Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, eastern Indian Ocean (ODP Site 762)</gco:CharacterString>2012-01-01publicationgeorefid:2013-020742Shamrock, Jamie L.University of Nebraska-Lincoln, Department of Geosciences, Lincoln, NE, United StatesauthorWatkins, David K.authorMicropaleontology Press, New York, NY, United StatespublisherdocumentHardcopyStratigraphy9 (1)1-54A 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.completedStratigraphyIsotope geochemistryalgaeassemblagesbiostratigraphybiozonesC-13/C-12Calcidiscus ellipticuscarbonCenozoicchemostratigraphycommunitiesCruciplacolithusCyclicargolithus parvusEoceneExmouth PlateauHayella situliformis ovataHexadelus archusIndian Oceanisotope ratiosisotopesLeg 122marine environmentMarkalius latusmicrofossilsmorphologynannofossilsnew taxaO-18/O-16Ocean Drilling ProgramODP Site 762oxygenpaleo-oceanographyPaleocene-Eocene Thermal MaximumpaleoclimatologypaleoecologypaleoenvironmentPaleogenePedinocyclus annulusPlantaestable isotopestaxonomyTertiaryurn:org.iodp:exp:122urnlargerWorkCitationcampaignurn:org.iodp:exp:122:site:762urnlargerWorkCitationstudyurn:org.iodp:exp:122urnlargerWorkCitationcampaignEnglishgeoscientificInformation112.1514112.1515-19.5315-19.5314