Early Pliocene radiolarian taxonomy and biostratigraphy in the Antarctic region

Author(s): Keany, J.
Author Affiliation(s): Primary:
Univ. R.I., Sch. Oceanogr., Kingston, R.I., United States
Volume Title: Micropaleontology
Source: Micropaleontology, 25(1), p.50-74. Publisher: American Museum of Natural History, New York, NY, United States. ISSN: 0026-2803 CODEN: MCPLAI
Note: In English. 71 refs.; illus. incl. plates
Summary: A detailed radiolarian biostratigraphy for Antarctic Early Pliocene sediments, with particular emphasis on the Gilbert Reversed Epoch (5.18 to 3.32 Ma) has been established by examination of a suite of Eltanin piston cores and DSDP cores from sites in the Southern Ocean. Five new partial-range zones, based on first and last appearances of several radiolarian species, have been defined for the Early Pliocene. The zones from oldest to youngest age are Anthocyrtidium ehrenbergi Zone, Triceraspyris pacifica Zone, Lychnocanium grande rugosum Zone Antarctissa longa Zone, and Helotholus vema Zone, ranging from the lowermost Gilbert to the Gauss-Matuyama boundary at 2.43 Ma. Detailed paleomagnetic analysis of the piston cores allows general correlation of the zones to the established magnetostratigraphic time scale. The new zonation offers inter-core correlations that are not always possible with the previously established zonations. Detailed inter-core correlations are also assisted by a high degree of similarity among reversible frequency changes of radiolarian species in these Pliocene sequences. (Auth.)
Year of Publication: 1979
Research Program: DSDP Deep Sea Drilling Project
Key Words: 10 Paleontology, Invertebrate; Abundance; Anshoyrtidiunehrenbergi Zone; Antarctic Ocean; Antarctica; Antarctissa longa Zone; Biostratigraphy; Cenozoic; Deep Sea Drilling Project; Faunal list; Gilbert Chron; Helotholus uema Zone; Invertebrata; Lower Pliocene; Lychnocanium grande rugosum Zone; Microfossils; Neogene; Paleomagnetism; Paleontology; Pliocene; Protista; Radiolaria; Spumellina; Taxonomy; Tertiary; Triceraspyris pacifica Zone
Record ID: 1980011407
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

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