Late Pliocene stratigraphic distribution of Globoconella taxa in the North Atlantic ...

• Main Authors: Chapman, Mark R, Funnell, Brian M, Weaver, Philip PE
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1998
• Subjects: Composite Core; Leg81; Leg108; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Ocean Drilling Program ODP; Weaver; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.679415; https://doi.pangaea.de/10.1594/PANGAEA.679415

Quantitative records of Globorotalia puncticulata and Globorotalia inflata, the last two members of the Globorotalia (Globoconella) lineage, obtained from North Atlantic sediments collected at DSDP Site 552, ODP Site 659 and ODP Site 665, are used to examine fluctuations in the biogeographic distribution of these species in the Late Pliocene between 3 and 2 Ma. Abundance data indicate that prior to the expansion of Northern Hemisphere glaciation at about 2.5 Ma, Gr. puncticulata was an important component of the planktonic foraminiferal fauna and had a geographic distribution ranging from 2°N to at least 56°N in the North Atlantic. A previously undescribed 6 chambered variant of Gr. puncticulata is found at both Sites 659 and 665. The stratigraphic distribution of this morphotype is restricted, first occurring at 2.9 Ma and then disappearing when glacial intensity increased at 2.75 Ma (isotope stage 110). Similar declines in Gr. puncticulata abundances occurred during glacial isotope stages 102, 100, and 98 ... : Supplement to: Chapman, Mark R; Funnell, Brian M; Weaver, Philip PE (1998): Isolation, extinction and migration within Late Pliocene populations of the planktonic foraminiferal lineage Globorotalia (Globoconella) in the North Atlantic. Marine Micropaleontology, 33(3-4), 203-222 ...