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Publication Detail
Trace fossils as diagnostic indicators of deep-marine environments, Middle Eocene Ainsa-Jaca basin, Spanish Pyrenees
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Heard TG, Pickering KT
  • Publisher:
    Blackwell Scientific
  • Publication date:
  • Pagination:
    809, 844
  • Journal:
  • Issue:
  • Status:
  • Print ISSN:
  • Notes:
    SUPPLEMENTARY MATERIAL The following supplementary material is available for this article: Appendix S1 Supplementary figures of trace fossils from the Ainsa-Jaca basin. Plates 1–18. This material is available as part of the online article from: http://www.blackwell-synergy.com/ doi/abs/10.1111/j.1365–3091.2007.00922.x (This link will take you to the article abstract).
A quantitative study of trace fossil abundance in the Middle Eocene deep-marine clastic systems, Ainsa-Jaca basin, Spanish Pyrenees, shows that they are powerful discriminators of submarine fan and related environments. Sixteen fan and related environments are recognized from upper-slope gully to the distal basin-floor. For each environment, the degree of bioturbation (density), trace-fossil diversity, number of pre-depositional and post-depositional trace fossils, as well as the number of graphoglyptid ichnospecies were quantified. In the more laterally confined and channel-dominated Ainsa basin, there is a trend of increasing bioturbation intensity and trace-fossil diversity away from channel-axis to off-axis environments. In the more unconfined and distal Jaca basin, there is a trend of increasing trace-fossil diversity and number of pre-depositional trace fossils including graphoglyptids from the channel-lobe transition to the fan-fringe. The trace-fossil assemblages of the Ainsa-Jaca basin are characteristic of a number of subichnofacies of the Nereites ichnofacies. In the distal Jaca basin, the Paleodictyon sub-ichnofacies occurs in the lobe-fringe and fan-fringe, whereas the distal basin-floor has a trace-fossil assemblage typical of the Paleodictyon sub-ichnofacies, but with a high proportion of post-depositional fodinichnia. Trace-fossil assemblages of proximal basin, axial, environments are characteristic of the Ophiomorpha rudis sub-ichnofacies, whilst proximal off-axis environments, have a mixed Paleodictyon-Ophiomorpha rudis subichnofacies trace-fossil assemblage.
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