Planktonic foraminifera at DSDP Holes 72-516 and 72-518 ...

• Main Authors: Barash, Max S, Oskina, Natalia S, Blyum, Natalia S
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1983
• Subjects: Drilling/drill rig; Leg72; Glomar Challenger; Deep Sea Drilling Project DSDP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.811803; https://doi.pangaea.de/10.1594/PANGAEA.811803

Quantitative analysis was performed on the Quaternary planktonic foraminiferal fauna from Site 516, near the crest of the Rio Grande Rise, and Site 518, on the lower western flank of the Rise. From Hole 516, 46 samples were taken, and from Hole 518, 80 samples were taken. The mean interval between samples is 20 to 25 cm. About 50 species of Quaternary and Pliocene planktonic foraminifers were identified. Quaternary sediments, dated by the initial evolutionary appearance of Globorotalia truncatulinoides and other criteria, have thickness, of 9.8 m in Hole 516 and 16 m in Hole 518. The Globorotalia truncatulinoides Zone is subdivided into four subzones or biostratigraphic horizons (from lower to upper): (1) Globorotalia crassaformis viola, (2) Globorotalia crassaformis hessi, (3) Globigerina calida calida, and (4) Globigerinoides ruber (pink). Thickness of these horizons in Hole 516 establishes the age of the boundaries between them as 1.47, 0.81, and 0.28 Ma, respectively. All the Quaternary planktonic ... : Supplement to: Barash, Max S; Oskina, Natalia S; Blyum, Natalia S (1983): Quaternary biostratigraphy and surface paleotemperatures based on planktonic foraminifers. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 849-869 ...