Swiss Journal of Geosciences

, Volume 111, Issue 3, pp 461–473 | Cite as

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

  • Jérémy Ragusa
  • Lina Maria Ospina-Ostios
  • Silvia Spezzaferri
  • Pascal Kindler


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 



We are grateful to the constructive review and remarks of the Chief Editor and critical reviews by Ursula Menkveld.

Supplementary material

15_2018_314_MOESM1_ESM.odt (25 kb)
Supplementary material 1 (ODT 24 kb) Online Resource 1: Foraminiferal distribution in studied samples
15_2018_314_MOESM2_ESM.eps (20 mb)
Supplementary material 2 (EPS 20514 kb) Online Resource 2: Microphotography of planktonic foraminiferal assemblages. 1a-c Turborotalia pomeroli (Toumarkine & Bolli 1970), Sample LM0135. 2a-c Turborotalia frontosa (Subbotina 1953), Sample NPK317. 3a-b Subbotina bassriverensis (Olsson and Hemleben 2006), Sample GF252. 4a-b Acarinina puntocarinata (Fleisher 1974), Sample GF347. 5a-b Acarinina bulbrooki (Postuma 1971), Sample LM0135
15_2018_314_MOESM3_ESM.eps (29.7 mb)
Supplementary material 3 (EPS 30369 kb) Online Resource 3: Microphotography of planktonic foraminiferal assemblages. 1a-c Globigerinatheka index (Finlay 1939), Sample LM0135. 2a-c Acarinina rohri (Bronnimann & Bermudez 1953), Sample LM219. 3a-c Acarinina topilensis (Cushman 1925), Sample LM219. 4a-c Paragloborotalia nana (Bolli 1957), Sample LM0135. 5a-c Praemurica lozanoi (Colon 1954), Sample LM0135. 6a-c Subbotina angiporoides (Hornibrook 1965), Sample LM0135. 7a-b Subbotina linaperta (Finlay 1939), Sample GF347


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Copyright information

© Swiss Geological Society 2018

Authors and Affiliations

  1. 1.Department of Earth SciencesUniversity of GenevaGenevaSwitzerland
  2. 2.Universidad del Valle, Escuela de Ingeniería Civil y GeomáticaCaliColombia
  3. 3.Unit of Earth Sciences, Department of GeosciencesUniversity of FribourgFribourgSwitzerland

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