(Table 1) Planktonic foraminiferal abundance at DSDP Site 94-606 ...

• Main Authors: Ehrmann, Lisa M, Keigwin, Lloyd D
• Format: Dataset
• Language: English
• Published: PANGAEA 1987
• Subjects: DEPTH, sediment/rock; Fragmentation index, planktic foraminifera; Foraminifera, benthic/planktic ratio; Globigerina woodi; Globigerina bulloides; Globorotalia puncticulata; Neogloboquadrina acostaensis; Globorotalia scitula; Neogloboquadrina pachyderma; Globigerina falconensis; Globorotalia hirsuta; Globigerinoides cf. ruber; Globigerinoides obliquus; Globigerinoides sacculifer; Globorotalia menardii; Sphaeroidinellopsis spp.; Globoquadrina altispira; Orbulina sp.; Globorotalia crassaformis; Globigerinella aequilateralis; Globigerinita glutinata; Foraminifera, planktic indeterminata; Foraminifera, planktic; Composite Core; Counting >180 µm fraction; Leg94; Glomar Challenger; Deep Sea Drilling Project DSDP; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788610; https://doi.pangaea.de/10.1594/PANGAEA.788610

A "total fauna" curve (Ruddiman, 1971; doi:10.1130/0016-7606(1971)82[283:PSITEA]2.0.CO;2) shows that surface water overlying DSDP Site 606 (central North Atlantic Ocean) cooled suddenly at 3.1 Ma, within the Mammoth paleomagnetic reversed interval. At that time, Globorotalia puncticulata, Neogloboquadrina pachyderma, and Globorotalia crassaformis increased and Globorotalia hirsuta, Globigerinoides sacculifer, and Sphaeroidinellopsis decreased in abundance. Oxygen isotope results for Globigerina bulloides do not indicate a "stepwise" cooling, but probably reflect small changes in continental ice volume. It is hypothesized that as annual average temperatures decreased, G. bulloides delayed its bloom from spring to summer to follow a preferred temperature habitat. ... : Supplement to: Ehrmann, Lisa M; Keigwin, Lloyd D (1987): Middle Pliocene change in planktonic foraminiferal fauna at Site 606. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 921-924 ...