New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains
Abstract In the central Jura Mountains (Western Switzerland), the Urgonien Jaune (UJ) facies with the Marnes de la Russille beds (MRu) have provided very rich nannofloras associated with very rare Tethyan ammonites. A late Early Barremian nannoflora of the Mid-Barremian Event (MBE, following a regio...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-12-01
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| Series: | Swiss Journal of Palaeontology |
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| Online Access: | https://doi.org/10.1186/s13358-020-00209-5 |
| _version_ | 1797789566581604352 |
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| author | Eric De Kaenel Pierre-Olivier Mojon Antoine Pictet |
| author_facet | Eric De Kaenel Pierre-Olivier Mojon Antoine Pictet |
| author_sort | Eric De Kaenel |
| collection | DOAJ |
| description | Abstract In the central Jura Mountains (Western Switzerland), the Urgonien Jaune (UJ) facies with the Marnes de la Russille beds (MRu) have provided very rich nannofloras associated with very rare Tethyan ammonites. A late Early Barremian nannoflora of the Mid-Barremian Event (MBE, following a regional tectonic event of an earliest Barremian synsedimentary tectonic crisis) was found in MRu of the lower UJ and includes 42 genera with 90 species. Among them, Biscutum jurensis De Kaenel, n. sp., Flabellites eclepensensis De Kaenel, n. sp., Palaeopontosphaera giraudii De Kaenel, n. sp., Rhagodiscus buisensis De Kaenel, n. sp., and Vagalapilla rutledgei De Kaenel, n. sp., are recognized as five new species. This nannoflora is a mixture of Boreal and Tethyan taxa with 20 nannofossil markers (Assipetra terebrodentarius, Broinsonia galloisii, Calcicalathina oblongata, Cyclagelosphaera rotaclypeata, Diloma placinum, Ethmorhabdus hauterivianus, Flabellites eclepensensis, Gorkaea pseudoanthophorus, Nannoconus abundans, Nannoconus pseudoseptentrionalis, Palaeopontosphaera giraudii, Palaeopontosphaera pinnata, Placozygus howei, Placozygus reticulatus, Reinhardtites scutula, Rhagodiscus buisensis, Rhagodiscus eboracensis, Tegulalithus septentrionalis, Tubodiscus jurapelagicus, Zeugrhabdotus moulladei) indicating very precisely the nannofossil Zones LK19 (Boreal)–NC5D (Tethyan) as well as the Elegans (Boreal) and Moutonianum (Tethyan) ammonite Zones of the latest Early Barremian. The ammonites in the basal UJ facies of Early Barremian age are reworked Lyticoceras claveli (Nodosoplicatum Zone, Early Hauterivian) and reworked Cruasiceras cf. cruasense (Sayni Zone, early Late Hauterivian), and Pseudometahoplites sp. juv. (Compressissima to Vandenheckii Zones, Early to Late Barremian transition) from the basal MRu. The new palaeontological and sequential results of this study allow a revision of previous data from Godet et al. (2010) precisely assigning a Barremian age to the MRu of the central Jura Mountains (Tethyan Compressissima to lower Sartousiana and Boreal uppermost Fissicostatum to middle Denckmanii ammonite Zones, Boreal LK20B-LK19-LK18 and Tethyan NC5D nannofossil Zones), within the Early to Late Barremian UJ (Tethyan Hugii to lower Sartousiana and Boreal Rarocinctum to middle Denckmanii ammonite Zones, Boreal LK20C to LK18 and Tethyan NC5C-NC5D nannofossil Zones) and below the Late Barremian Urgonien Blanc facies (Tethyan Sartousiana ammonite Zone). |
| first_indexed | 2024-03-13T01:52:29Z |
| format | Article |
| id | doaj.art-6ed2f4ea41da4993933548b4bd65ff46 |
| institution | Directory Open Access Journal |
| issn | 1664-2376 1664-2384 |
| language | English |
| last_indexed | 2024-03-13T01:52:29Z |
| publishDate | 2020-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Swiss Journal of Palaeontology |
| spelling | doaj.art-6ed2f4ea41da4993933548b4bd65ff462023-07-02T11:26:07ZengSpringerOpenSwiss Journal of Palaeontology1664-23761664-23842020-12-011391539510.1186/s13358-020-00209-5New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura MountainsEric De Kaenel0Pierre-Olivier MojonAntoine Pictet1DPR (De Kaenel Paleo Research)Musée Cantonal de géologie, Quartier UNIL-DorignyAbstract In the central Jura Mountains (Western Switzerland), the Urgonien Jaune (UJ) facies with the Marnes de la Russille beds (MRu) have provided very rich nannofloras associated with very rare Tethyan ammonites. A late Early Barremian nannoflora of the Mid-Barremian Event (MBE, following a regional tectonic event of an earliest Barremian synsedimentary tectonic crisis) was found in MRu of the lower UJ and includes 42 genera with 90 species. Among them, Biscutum jurensis De Kaenel, n. sp., Flabellites eclepensensis De Kaenel, n. sp., Palaeopontosphaera giraudii De Kaenel, n. sp., Rhagodiscus buisensis De Kaenel, n. sp., and Vagalapilla rutledgei De Kaenel, n. sp., are recognized as five new species. This nannoflora is a mixture of Boreal and Tethyan taxa with 20 nannofossil markers (Assipetra terebrodentarius, Broinsonia galloisii, Calcicalathina oblongata, Cyclagelosphaera rotaclypeata, Diloma placinum, Ethmorhabdus hauterivianus, Flabellites eclepensensis, Gorkaea pseudoanthophorus, Nannoconus abundans, Nannoconus pseudoseptentrionalis, Palaeopontosphaera giraudii, Palaeopontosphaera pinnata, Placozygus howei, Placozygus reticulatus, Reinhardtites scutula, Rhagodiscus buisensis, Rhagodiscus eboracensis, Tegulalithus septentrionalis, Tubodiscus jurapelagicus, Zeugrhabdotus moulladei) indicating very precisely the nannofossil Zones LK19 (Boreal)–NC5D (Tethyan) as well as the Elegans (Boreal) and Moutonianum (Tethyan) ammonite Zones of the latest Early Barremian. The ammonites in the basal UJ facies of Early Barremian age are reworked Lyticoceras claveli (Nodosoplicatum Zone, Early Hauterivian) and reworked Cruasiceras cf. cruasense (Sayni Zone, early Late Hauterivian), and Pseudometahoplites sp. juv. (Compressissima to Vandenheckii Zones, Early to Late Barremian transition) from the basal MRu. The new palaeontological and sequential results of this study allow a revision of previous data from Godet et al. (2010) precisely assigning a Barremian age to the MRu of the central Jura Mountains (Tethyan Compressissima to lower Sartousiana and Boreal uppermost Fissicostatum to middle Denckmanii ammonite Zones, Boreal LK20B-LK19-LK18 and Tethyan NC5D nannofossil Zones), within the Early to Late Barremian UJ (Tethyan Hugii to lower Sartousiana and Boreal Rarocinctum to middle Denckmanii ammonite Zones, Boreal LK20C to LK18 and Tethyan NC5C-NC5D nannofossil Zones) and below the Late Barremian Urgonien Blanc facies (Tethyan Sartousiana ammonite Zone).https://doi.org/10.1186/s13358-020-00209-5BiostratigraphyAmmonitesNannofossilsUrgonian faciesBarremianJura Mountains |
| spellingShingle | Eric De Kaenel Pierre-Olivier Mojon Antoine Pictet New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains Swiss Journal of Palaeontology Biostratigraphy Ammonites Nannofossils Urgonian facies Barremian Jura Mountains |
| title | New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains |
| title_full | New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains |
| title_fullStr | New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains |
| title_full_unstemmed | New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains |
| title_short | New biostratigraphical data (calcareous nannofossils, ammonites) and Early to Late Barremian transition in the Urgonien Jaune facies and Marnes de la Russille complex of the Swiss Jura Mountains |
| title_sort | new biostratigraphical data calcareous nannofossils ammonites and early to late barremian transition in the urgonien jaune facies and marnes de la russille complex of the swiss jura mountains |
| topic | Biostratigraphy Ammonites Nannofossils Urgonian facies Barremian Jura Mountains |
| url | https://doi.org/10.1186/s13358-020-00209-5 |
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