Southern High-Latitude Diatom Biostratigraphy
F. M. Weaver, A. M. Gombos, Jr., 1981. "Southern High-Latitude Diatom Biostratigraphy", The Deep Sea Drilling Project: A Decade of Progress, John E. Warme, Robert G. Douglas, Edward L. Winterer
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The development of Cenozoic and Mesozoic southern high-latitude diatom biostratigraphy over the past fifteen years is summarized with emphasis on significant advancements resulting from deep-sea drilling in the Antarctic and Sub- Antarctic regions.
Regional differences in diatom distribution and occurrence in Neogene sediments recovered at DSDP Sites 266 and 278 are compared. Spatial and temporal variance in species as reported in earlier investigations results from several factors: 1) the lack of continuous coring at Site 266, 2) relative incompleteness of the Neogene record recovered at Sites 266 and 278, 3) unrecognized unconformities, 4) regional paleobiogeographic differences, 5) applied taxonomy, and 6) incomplete species range documentation.
We propose a regionally applicable Neogene diatom zonation utilizing easily recognizable species with broad geographic distribution. This biostratigraphic framework consists of five previously defined and six modified zones from DSDP Legs 28 and 29 reports. In addition, we propose five new zones and document sixteen datums having apparent regional significance.
We herein provide the datums used for geochronologic subdivision and the correlation of epoch boundaries in Sites 266 and 278, floral references for all stratigraphically significant species, and a comprehensive bibliography on Southern Ocean diatoms.
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At the present the Glomar Challenger has drilled over 500 holes over the world ocean, involving hundreds of scientists from dozens of countries. This volume is intended as a review of some of theimportant results from the most comprehensive, ambitious and successful earth-bound geologic project ever undertaken. The symposium upon which this volume originated was held April 4, 1979 at the SEPM/AAPG Annual Meeting in Houston. No comprehensive synthesis of all aspects of the DSDP has appeared, and the topic coverage in this volume is biased towards the sediments and fossils, and their significance for certain aspects of earth history – paleogeography, bathymetry, climatology, oceanography, ecology, environments – all in keeping with the audience of sedimentary geologists.