Cyclostratigraphy of the Cenomanian in the Gubbio District, Italy: A Field Study

  1. P. L. de Boer2 and
  2. D. G. Smith3
  1. W. Schwarzacher

Published Online: 29 APR 2009

DOI: 10.1002/9781444304039.ch8

Orbital Forcing and Cyclic Sequences

Orbital Forcing and Cyclic Sequences

How to Cite

Schwarzacher, W. (1994) Cyclostratigraphy of the Cenomanian in the Gubbio District, Italy: A Field Study, in Orbital Forcing and Cyclic Sequences (eds P. L. de Boer and D. G. Smith), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304039.ch8

Editor Information

  1. 2

    Utrecht, The Netherlands

  2. 3

    London, UK

Author Information

  1. School of Geosciences, Queen's University Belfast, Belfast, UK

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 28 JAN 1994

ISBN Information

Print ISBN: 9780632037360

Online ISBN: 9781444304039

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Keywords:

  • cyclostratigraphy of Cenomanian in Gubbio district;
  • contessa highway;
  • petrano;
  • base of Monte petrano;
  • bundle-Triassic platform limestones

Summary

The Cenomanian of the Central Apennines in Italy shows well-developed stratification cycles. Groups of four to seven beds form a ‘bundle’; adjacent bundles are often separated by a marl layer. Two sections in the Scaglia Bianca (top Albian to Cenomanian) approximately 20 km apart have been correlated and in both sections 65–70 cycles have been recognized. Absolute time estimates make it likely that the cycles are controlled by the 100-ka eccentricity cycle. The length of the Cenomanian excluding the Bonarelli horizon is estimated to be 5.8–6.2 Ma. Spectral analysis and filtering indicates evidence also of a 400-ka cycle. The quality of data and the lengths of the sections were insufficient to prove the existence of longer cycles.