A reappraisal of the position of Chron C25n in the Campo section (Huesca province, south-central Pyrenees).

  1. Pujalte, V. 1
  2. Dinarès-Turell, J. 2
  3. Bernaola, G. 3
  4. Baceta, J.I. 1
  5. Payros, A. 1
  1. 1 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

  2. 2 lstituto Nazionale di Geofisica e Vulcanologia, Italia
  3. 3 Universita degli Studi di Firenze, Italia
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Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2003

Issue: 34

Pages: 155-158

Type: Article

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Abstract

Upper Thanetian strata of the Campo section, in the southern Pyrenees, were assigned by previous authors to geomagnetic Chron C25r. Such attribution, however, is rendered obsolete by the discovery of Discoaster multiradiatus in beds situated 35 m below the Thanetian-Ilerdian boundary, since this calcareous nannofossil first appeared within C25n. Further, a biometric study shows that these D. multiradiatus have a chronostratigraphic position well above the base of Chron C24r. Therefore, magneto-biostratigraphic calibrations based on former interpretations must be revised. A new magnetostratigraphic study has found a previously undetected interval with normal magnetic polarities beneath the beds with D. multiradiatus, which presumably represents Chron C25n. However, more data will be necessary to substantiate that option.

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