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CALCAREOUS NANNOFOSSIL EVENTS IN THE LOWER-MIDDLE PLEISTOCENE TRANSITION AT THE MONTALBANO JONICO SECTION AND ODP SITE 964: CALIBRATION WITH ISOTOPE AND SAPROPEL STRATIGRAPHY

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      Abstract

      <p class="abstract-testo">We present quantitative data on calcareous nannofossil biostratigraphy in the section of Montalbano Jonico (Southern Italy). This is one of the candidate Global Statotype Section and Point (GSSP) of the Middle Pleistocene. The first common occurrence (FCO) and last common occurrence (LCO) of <em>Reticulofenestra asanoi</em> are well detectable in the section and are here proposed as additional events for improving biostratigraphic resolution in the interval corresponding to the transition between the small <em>Gephyrocapsa</em> Zone and <em>Pseudoemiliania lacunosa</em> Zone. The potential value of the bioevents is tested in a Mediterranean deep-sea core of ODP Site 964, located in the Ionian Sea. At Site 964 the FCO of <em>R. asanoi</em> occurs in the marine oxygen isotope stage (MIS) 30, and the LCO of the species correlates with MIS 23. The ages of the FCO and LCO of <em>R. asanoi</em> have been estimated at 1.06 Ma and 0.93 Ma respectively. The first occurrence (FO) of <em>Gephyrocapsa</em> sp. 3 has been correlated to MIS 25, both at Site 964 and at the Montalbano Jonico section. The age of the FO of <em>Gephyrocapsa</em> sp. 3 is estimated at 0.95 Ma, based on the astronomical datings of sapropels occurring at the Montalbano Jonico section. In addition, an interval of temporary disappearance of <em>Gephyrocapsa</em> sp. 3 has been identified within the <em>P. lacunosa</em> Zone. The beginning of this interval is correlated with MIS 20/19 and can be considered a reliable event in the Mediterranean area, occurring close to the Brunhes/Matuyama magnetic boundary. The recognized events provide a basis for interpreting the Montalbano Jonico section within a standard chronostratigraphic framework.</p><p class="abstract-testo"></p>

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      Author and article information

      Journal
      Rivista Italiana di Paleontologia e Stratigrafia
      Università degli Studi di Milano
      01 July 2004
      : 110
      : 2
      84450ae57ef24600b8aaee6417e29ad2 10.13130/2039-4942/5823

      RIPS is published under a Creative Commons Attribution-NonCommercial-NoDerivatives Licence 4.0 International (CC BY-NC-ND 4.0). The journal allows the author(s) to hold the copyright without restrictions. To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-nd/4.0/

      Categories
      Geology
      QE1-996.5
      Paleontology
      QE701-760

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