Scientific article

Revision of the planktonic foraminiferal biostratigraphy of the Voirons Flysch (Chablais Prealps, Haute-Savoie, France)

Published inSwiss Journal of Geosciences, vol. 111, no. 3, p. 461-473
Publication date2018

The ages obtained from planktonic foraminiferal assemblages retrieved from two exposures in the Gurnigel Flysch and from the re-examination of similar material gathered by previous researchers from the Voirons Flysch reveal only minor discrepancies with previous studies based on nannofossil biostratigraphy. In contrast, major divergences between this work and previous studies on the Voirons Flysch also based on planktonic foraminifera have been identified. They are generally related to distinct approaches in species classification and the use of different zonal schemes. Based on our data, the age of the Voirons Flysch extends from the Early Eocene (planktonic foraminiferal zone P7) to the Middle Eocene (planktonic foraminiferal zone P12). Contrasting with claims made in earlier studies, no specimen of Late Eocene or Early Oligocene age has been observed in the revised material. However, we cannot exclude a younger age (possibly Late Eocene) for the upper portion of this flysch from which we did not revise any sample. Thus, more research and sampling are needed to resolve this question. The palaeogeographic origin of the Voirons-Wägital complex as well as the sedimentation history of these flyschs need now to be re-evaluated in light of this revised biostratigraphic data.

  • Biostratigraphy
  • Flysch
  • Palaeogene
  • Planktonic foraminifera
  • Valais domain
  • Voirons-Wägital complex
Citation (ISO format)
RAGUSA, Jeremy et al. Revision of the planktonic foraminiferal biostratigraphy of the Voirons Flysch (Chablais Prealps, Haute-Savoie, France). In: Swiss Journal of Geosciences, 2018, vol. 111, n° 3, p. 461–473. doi: 10.1007/s00015-018-0314-7
Main files (1)
Article (Published version)
ISSN of the journal1661-8726

Technical informations

Creation05/20/2019 8:50:00 PM
First validation05/20/2019 8:50:00 PM
Update time03/15/2023 4:31:47 PM
Status update03/15/2023 4:31:46 PM
Last indexation10/19/2023 10:34:38 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack