The semichatovae Event is a mid–late Frasnian (Late Devonian) episode of a major marine transgression that coincides with the spread of the conodont Palmatolepis semichatovae. The occurrence of this species and the associated event were therefore proposed to define the Middle–Late Frasnian boundary. As this species is not found on the north Gondwana platforms, this event is documented only on the Laurussia marine outer shelves. As such, it is not known in the Frasnian reference section within the Upper Quarry Coumiac, located in the Montagne Noire (southern France). In this contribution, we have used a multidisciplinary approach that combines sedimentology, conodont assemblages, magnetic susceptibility and concentrations of certain elements that are indicative of detrital components to precisely date this event in the absence of Palmatolepis semichatovae by means of global-scale correlations. We found that a significant part of the environmental signal has been preserved in the strata, and we could locate the semichatovae transgressive event in the cross-section in the lower part of Zone FZ 11. During this period of recurrent environmental perturbations, conodonts responded to sea-level changes only above a certain depth threshold, which is reached only with the semichatovae event.
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December 20, 2024
Detecting the late Frasnian semichatovae Event on the deep shelf of north Gondwana
Catherine Girard;
Catherine Girard
*
1
ISEM, Université de Montpellier, CNRS, EPHE, IRD
, Montpellier, France
*
Correspondence: [email protected]
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Paul Antonio;
Paul Antonio
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
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Pierre Camps;
Pierre Camps
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
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Jean-Jacques Cornée;
Jean-Jacques Cornée
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
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Raimund Feist;
Raimund Feist
1
ISEM, Université de Montpellier, CNRS, EPHE, IRD
, Montpellier, France
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Christine Leredde
Christine Leredde
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
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Catherine Girard
*
1
ISEM, Université de Montpellier, CNRS, EPHE, IRD
, Montpellier, France
Paul Antonio
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
Pierre Camps
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
Jean-Jacques Cornée
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
Raimund Feist
1
ISEM, Université de Montpellier, CNRS, EPHE, IRD
, Montpellier, France
Christine Leredde
2
Géosciences Montpellier
, Université de Montpellier, CNRS, Université des Antilles
, Montpellier, France
*
Correspondence: [email protected]
Publisher: Geological Society of London
Received:
26 Jul 2024
Revision Received:
23 Oct 2024
Accepted:
11 Nov 2024
First Online:
19 Nov 2024
Online ISSN: 2041-479X
Print ISSN: 0016-7649
© 2024 The Author(s). Published by The Geological Society of London. All rights, including for text and data mining (TDM), artificial intelligence (AI) training, and similar technologies, are reserved. For permissions: https://www.lyellcollection.org/publishing-hub/permissions-policy. Publishing disclaimer: https://www.lyellcollection.org/publishing-hub/publishing-ethics
© 2024 The Author(s)
Journal of the Geological Society (2025) 182 (2): jgs2024-147.
Article history
Received:
26 Jul 2024
Revision Received:
23 Oct 2024
Accepted:
11 Nov 2024
First Online:
19 Nov 2024
Citation
Catherine Girard, Paul Antonio, Pierre Camps, Jean-Jacques Cornée, Raimund Feist, Christine Leredde; Detecting the late Frasnian semichatovae Event on the deep shelf of north Gondwana. Journal of the Geological Society 2024;; 182 (2): jgs2024–147. doi: https://doi.org/10.1144/jgs2024-147
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Index Terms/Descriptors
- assemblages
- biofacies
- biogeography
- biostratigraphy
- biozones
- Central Massif
- chemical composition
- Chordata
- Conodonta
- correlation
- deep-water environment
- depth
- detritus
- Devonian
- Europe
- event stratigraphy
- France
- Frasnian
- Gondwana
- Laurussia
- magnetic properties
- magnetic susceptibility
- marine environment
- microfacies
- microfossils
- Montagne Noire
- occurrence
- paleoenvironment
- paleomagnetism
- Paleozoic
- Palmatolepis
- pelagic environment
- sea-level changes
- sedimentology
- sequence stratigraphy
- shelf environment
- spectra
- stratigraphic boundary
- stratotypes
- succession
- transgression
- Upper Devonian
- upper Frasnian
- Vertebrata
- Western Europe
- X-ray fluorescence spectra
- Palmatolepis semichatovae
- Coumiac Quarry
Latitude & Longitude
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