Unknown
PANGAEA
In:
Supplement to: Tjalsma, R C (1983): Eocene to Miocene benthic foraminifers from DSDP Site 516, Rio Grande Rise, South Atlantic. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 731-755, https://doi.org/10.2973/dsdp.proc.72.133.1983
Publication Date:
2023-07-10
Description:
DSDP Site 516 contains a complete middle Eocene to lower Miocene interval with a well-developed Oligocene sequence that is more than 300 m thick. In this paper, the most important and characteristic benthic foraminiferal species from this interval are described and illustrated, and their quantitative and biostratigraphic distribution is given. Middle Eocene benthic assemblages, derived from pelagic intercalations in a partly turbiditic sequence, are low in diversity. Benthic assemblages of fairly high diversity occur in limestones, chalks, and oozes of the upper Eocene to lower Miocene. The consistently high rate of new species appearances at Site 516 during late Eocene and Oligocene contrasted greatly with the very slow rate of change in abyssal faunas at that time; there were no significant faunal changes at the Eocene/Oligocene boundary. The assemblages are dominated by Cibicidoides (mostly C. ungerianus or C. kullenbergi) and Lenticulina. Buliminids were also important during the Eocene and early Oligocene. Faunal comparison with other Atlantic DSDP sites and drill holes in the Gulf of Mexico suggest an approximately mid-bathyal (500-1500 m) depth of deposition during late Eocene and Oligocene.
Keywords:
72-516; 72-516F; Alabamina wilcoxensis; Anomalina capita; Anomalina corrugata; Anomalina pseudogrosserugosa; Anomalina semipunctata; Anomalina spissiformis; Anomalinoides cf. alazaensis; Astrononion pusillum; Bolivina tectiformis; Bulimina alazanensis; Bulimina impendens; Bulimina macilenta; Bulimina tuxpamensis; Buliminella grata; Cassidulina havanensis; Cibicidoides cicatricosus; Cibicidoides dickersonii; Cibicidoides haitensis; Cibicidoides laurisae; Cibicidoides mexicanus; Cibicidoides perlucidus; Cibicidoides reussii; Cibicidoides sp.; Cibicidoides tuxpamensis; Cibicidoides ungerianus; Counting 〉149 µm fraction; Deep Sea Drilling Project; Discorbis subvilardeboanus; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eggerella bradyi; Event label; Foraminifera, benthic; Gavelinella micra; Globocassidulina subglobosa; Glomar Challenger; Gyroidinoides spp.; Hanzawaia cushmani; Karreriella subglabra; Leg72; Lenticulina spp.; Martinottiella scabra; Nonion havanense; Nuttallides truempyi; Nuttallides umbonifera; Oridorsalis umbonatus; Osangularia culter; Osangularia mexicana; Planktic foraminifera zone; Planulina karsteni; Planulina renzi; Plectina elongata; Pleurostomella spp.; Pullenia bulloides; Pullenia eocenica; Pullenia quinqueloba; Rectuvigerina vesca; Reussella oligocenica; Rotaliatina mexicana; Sample code/label; Siphonina tenuicarinata; South Atlantic/CONT RISE; Sphaeroidina bulloides; Stilostomella aculeata; Stilostomella curvatura; Textularia flintii; Textularia milletti; Trifarina bradyi; Trifarina danvillensis; Turrilina robertsi; Uvigerina auberiana; Uvigerina elongata; Uvigerina havanensis; Uvigerina mexicana; Uvigerina rippensis; Uvigerina spinulosa; Vulvulina spp.
Type:
Dataset
Format:
text/tab-separated-values, 2414 data points
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