Distribution of planktonic foraminifera in DSDP Hole 31-296 (Table III)

• Main Author: Keller, Gerta
• Format: Dataset
• Language: English
• Published: PANGAEA 1979
• Subjects: 31-296; Counting >62 µm fraction; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Foraminifera; planktic; planktic indeterminata; planktic preservation; Globigerina apertura; Globigerina bulbosa; Globigerina bulloides; Globigerina decoraperta; Globigerina druryi; Globigerina falconensis; Globigerina foliata; Globigerina nepenthes; Globigerina praebulloides; Globigerina praedigitata; Globigerina quadrilatera; Globigerina quinqueloba; Globigerina rubescens; Globigerina umbilicata; Globigerina woodi; Globigerinella siphonifera; Globigerinita glutinata; Globigerinita iota; Globigerinita tenellus; Globigerinita uvula; Globigerinoides bollii; Globigerinoides conglobatus; Globigerinoides fistulosus; Globigerinoides obliquus; Globigerinoides obliquus extremus; Globigerinoides quadrilobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina altispira; Globoquadrina asanoi; Globoquadrina venezuelana; Globorotalia bononiensis; Globorotalia cf. conomiozea; Globorotalia cf. miozea; Globorotalia cf. praemiocenica; Globorotalia cf. puncticulata; Keller; Pacific; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.706057; https://doi.org/10.1594/PANGAEA.706057

Late Neogene planktonic foraminiferal biostratigraphy of DSDP Site 296, Leg 31, reveals this site as an ideal reference section for correlation of Blow's low-latitude zonation with the mid-latitude zonation for temperate faunal assemblages developed in this paper and earlier for DSDP Site 310, Leg 31 (Keller). Abundance of temperate species of Globorotalia (G. inflata, G. puncticulata, G. crassaformis, G. conomiozea) permit correlation with the zonal subdivision developed at Site 310 based on these species. Evolutionary changes within the Globorotalia inflata group also appear to be consistent biostratigraphie markers in mid latitudes; a primitive variety of this species first appears at about 3.3-3.1 Ma, G. inflata praeinflata appears at about 2.6 Ma, and the modern form appears at about 2.2-2.1 Ma. Quantitative analyses of planktonic foraminifera at DSDP Site 296 reveal an inversely reciprocal frequency oscillation between species of Globorotalia and the Globigerina-Globigerinita group. Cool climatic periods are characterized by high frequencies in the Globigerina-Globigerinita group and low frequencies in the Globorotalia group, whereas warm intervals are marked by high frequencies in the Globorotalia group and low frequencies in the Globigerina-Globigerinita group. Five cool paleoclimatic events can be recognized between early Pliocene and late Pleistocene: 4.4 Ma, 3.2-3.1 Ma, 2.4-2.2 Ma, 1.2 Ma, and 0.7 Ma. These paleoclimatic/paleoceanographic events have also been recognized in planktonic foraminifera of the Central and Northeast Pacific DSDP Sites 310 and 173 and also correlate to cold events recognized in oxygen isotope measurements of DSDP Site 310 and in equatorial Pacific cores.