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Solid Earth An interactive open-access journal of the European Geosciences Union

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© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
19 Sep 2012
Review status
This discussion paper has been under review for the journal Solid Earth (SE). The revised manuscript was not accepted.
Ammonoid multi-extinction crises during the Late Pliensbachian – Toarcian and carbon cycle instabilities
J. Guex1, A. Bartolini2, J. Spangenberg3, J.-C. Vicente4, and U. Schaltegger5 1Institute of Geology, Anthropole, University of Lausanne, Switzerland
2Museum d'Histoire Naturelle, Paris, France
3Institute of Geochemistry, Anthropole,University of Lausanne, Switzerland
4Dept. of Geology, Université Pierre et Marie Curie, Paris, France
5Earth and Environmental Sciences, University of Geneva, Rue des Maraîchers 13, 1205, Geneva, Switzerland
Abstract. Five crises affecting ammonite evolution occurred during the Late Pliensbachian to Late Toarcian stages (Early Jurassic). The first two (Gibbosus and end-Spinatum zones) occurred during highly cold and regressive conditions which were followed by a global anoxic event generated during a supergreenhouse warm event (Levisoni subzone) concomitant with a worldwide transgressive event. The last two (Late Variabilis and Late Insigne zones) are related to regressive events. We present new carbon isotope data from Southern Peru that demonstrate that most of the major Toarcian crises affecting ammonite evolution can be correlated with the variations affecting the δ13C during that unstable period. The morphogenetic reactions of the ammonites during the five different upper Liassic critical episodes are analysed, showing how this group can be used as stress indicators.

Citation: Guex, J., Bartolini, A., Spangenberg, J., Vicente, J.-C., and Schaltegger, U.: Ammonoid multi-extinction crises during the Late Pliensbachian – Toarcian and carbon cycle instabilities, Solid Earth Discuss., 4, 1205-1228, doi:10.5194/sed-4-1205-2012, 2012.
J. Guex et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC C585: 'Toarcian ammonoid extinction', Anonymous Referee #1, 24 Oct 2012 Printer-friendly Version 
AC C697: 'REPLY TO REVIEWER 1', Jean Guex, 29 Nov 2012 Printer-friendly Version 
RC C588: 'Review of Ammonoid multi-extinction crises', Anonymous Referee #2, 25 Oct 2012 Printer-friendly Version 
AC C699: 'REPLY TO REVIEWER 2', Jean Guex, 29 Nov 2012 Printer-friendly Version 
J. Guex et al.
J. Guex et al.


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