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Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Bruno GRANIER
Robert BUSNARDO
Bernar...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
As in both aforementioned
sections t...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
As in both aforementioned
sections t...
A rich ammonite fauna
was collected while
measuring the section;
hereafter we listed some
significative findings,
which be...
A rich ammonite fauna
was collected while
measuring the section;
hereafter we listed some
significative findings,
which be...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Level 42 (Nicklesi Zone)
•Taveraidis...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
The coarse-grained
floatstone and gr...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
The highest discrepancies
appear wit...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
On the contrary, the best
match was ...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Our first record of the
well-known P...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
Another example is given
by four rep...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
The highest discrepancies
appear wit...
Refurbishing the Urgonian biostratigraphy:
A key section at L’Estellon, Drôme, France
As for previous publications (Conrad...
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Refurbishing the Urgonian biostratigraphy

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A key section at L’Estellon, Drôme, France (a presentation given by Bruno R.C. Granier and coauthors on the occasion of STRATI2013). As for previous publications (Conrad et al., 2012; Charollais et al., 2013), we question the relevance of the conclusions and hypotheses of any published work based on the biased stratigraphic distribution ranges for the orbitolinids, i.e., any work based on Arnaud-Vanneau's (Arnaud-Vanneau et al., 2005, and earlier versions). There are 3 related publications: http://paleopolis.rediris.es/cg/CG2013_A03/index.html + http://paleopolis.rediris.es/cg/CG2013_A04/index.html + http://paleopolis.rediris.es/cg/CG2017_B01/CG2017_B01.pdf

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Refurbishing the Urgonian biostratigraphy

  1. 1. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France Bruno GRANIER Robert BUSNARDO Bernard CLAVEL Michel MOULLADE Jean CHAROLLAIS Guy TRONCHETTI Pierre DESJACQUES L’Estellon section is located in the Diois (Drôme department, SE France), near the locality of Nyons, a few kilometres north to the Chaudebonne section (Moullade, 1966) and south to the Crupies section (Ferry, 1976).
  2. 2. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France As in both aforementioned sections the succession, which consists of basinal marls and associated vermicular limestones, includes a number of strata made of conglomerates (debris-flows) and bioclastic allodapic calcarenites (turbidites) [one of them been locally known as “barre à orbitolines”] (from Granier et al., in press). Phyllopachyceras
  3. 3. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France As in both aforementioned sections the succession, which consists of basinal marls and associated vermicular limestones, includes a number of strata made of conglomerates (debris-flows) and bioclastic allodapic calcarenites (turbidites) [one of them been locally known as “barre à orbitolines”] (from Granier et al., in press). Zoophycos
  4. 4. A rich ammonite fauna was collected while measuring the section; hereafter we listed some significative findings, which begin with Late Hauterivian forms (Crioceratites sp., Pseudothurmannia sp., P. sarasini), followed by Early (Emericiceras emerici, Taveraidiscus sp., Taveraidiscus hugii, Barremites sp.) and Late (Heinzia sayni, Toxancyloceras vandenheckei, Gerhardtia sartousiana, Hemihoplites cf. feraudianus, Acantholytoceras sp., Heteroceras sp.) Barremian representatives. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France
  5. 5. A rich ammonite fauna was collected while measuring the section; hereafter we listed some significative findings, which begin with Late Hauterivian forms (Crioceratites sp., Pseudothurmannia sp., P. sarasini), followed by Early (Emericiceras emerici, Taveraidiscus sp., Taveraidiscus hugii, Barremites sp.) and Late (Heinzia sayni, Toxancyloceras vandenheckei, Gerhardtia sartousiana, Hemihoplites cf. feraudianus, Acantholytoceras sp., Heteroceras sp.) Barremian representatives. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France
  6. 6. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France Level 42 (Nicklesi Zone) •Taveraidiscus hugii (Ooster, 1860) •Emericiceras emerici (Léveillé, 1837) (from Busnardo et al., in press). Note: Scarce occurrences of planktonic foraminifers and deep water benthic foraminifers are reported from the washed residues of the marls and contributed to date some intervals.
  7. 7. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France The coarse-grained floatstone and grainstone facies bear a number of foraminifers and calcareous algae laterally transported (“freshly reworked”) from the carbonate shelves surrounding the Vocontian Trough (from the west, i.e., from the neighbouring Vivarais, Ardèche department). Their co- occurrence with basinal fossils allows us to calibrate their FAD and LAD directly on the ammonite biozones.
  8. 8. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France
  9. 9. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France
  10. 10. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France
  11. 11. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France The highest discrepancies appear with Arnaud- Vanneau‘s (2005).
  12. 12. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France On the contrary, the best match was obtained with Clavel‘s (2007, 2010).
  13. 13. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France Our first record of the well-known Palorbitolina lenticularis dates back from the Pulchella Zone of the Lower Barremian strata, instead of from the top of the Sartousiana Zone of the Upper Barremian (from Granier et al., in press). 0.5mm
  14. 14. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France Another example is given by four representatives (kiliani, buccifer, briacensis, cuvillieri) of the genus Orbitolinopsis, which have been said to be Bedoulian (= “Early Aptian”) in age, whereas we found these taxa occur in Lower Barremian strata (from Granier et al., in press). 0.5mm
  15. 15. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France The highest discrepancies appear with Arnaud- Vanneau‘s (2005). The best match was obtained with Clavel‘s (2007, 2010).
  16. 16. Refurbishing the Urgonian biostratigraphy: A key section at L’Estellon, Drôme, France As for previous publications (Conrad et al., 2012; Charollais et al., 2013), we question the relevance of the conclusions and hypotheses of any published work based on the biased stratigraphic distribution ranges for the orbitolinids, i.e., any work based on Arnaud-Vanneau's (Arnaud-Vanneau et al., 2005, and earlier versions).
  • MichelSeptfontaine

    Dec. 10, 2017

A key section at L’Estellon, Drôme, France (a presentation given by Bruno R.C. Granier and coauthors on the occasion of STRATI2013). As for previous publications (Conrad et al., 2012; Charollais et al., 2013), we question the relevance of the conclusions and hypotheses of any published work based on the biased stratigraphic distribution ranges for the orbitolinids, i.e., any work based on Arnaud-Vanneau's (Arnaud-Vanneau et al., 2005, and earlier versions). There are 3 related publications: http://paleopolis.rediris.es/cg/CG2013_A03/index.html + http://paleopolis.rediris.es/cg/CG2013_A04/index.html + http://paleopolis.rediris.es/cg/CG2017_B01/CG2017_B01.pdf

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