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| High-resolution stratigraphy of the Cenomanian-Turonian boundary interval at Pueblo (USA) and wadi Bahloul (Tunisia) stable isotope and bio-events correlation Caron, M.; Dall'Agnolo, S.; Accarie, H.; Barrera, E.; Kauffman, E.G.; Amedro, F.; Robaszynski, F. (2006). High-resolution stratigraphy of the Cenomanian-Turonian boundary interval at Pueblo (USA) and wadi Bahloul (Tunisia) stable isotope and bio-events correlation. Géobios 39(2): 171-200. dx.doi.org/10.1016/j.geobios.2004.11.004
In: Géobios. Association Européenne de Paléontologie: Lyon. ISSN 0016-6995; e-ISSN 1777-5728, meer
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Geological time > Phanerozoic > Geological time > Mesozoic > Cretaceous > Cretaceous, Upper > Turonian Ammonoida † [WoRMS]; Foraminifera [WoRMS] America, USA; Tunisia [Marine Regions] Marien/Kust |
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Several important biological and geochemical events determined in these sections relative to the ammonite zonation of the CTBI are listed below in chronological order from old to young: 1. FO (first occurrence) of Sciponoceras gracile-Metoicoceras geslinianum ammonite Assemblage-Zone, 2. delta C-13 peak 1, 3. LO (last occurrence) of Rotalipora cushmani, 4. "Heterohelic shift", 5. FO of the ammonites Pseudaspidoceras pseudonodosoides and Neocardioceras juddii, 6. delta C-13 peak II, 7. delta C-13 peak III, 8. LO of Cenomanian ammonites (Ps. pseudonodosoides and N. juddii), 9. LO of Anaticinella, 10. FO of Turonian ammonites (Watinoceras devonense, base of the Turonian stage), 11. "filament event", 12. FO of Pseudaspidoceras flexuosum, 13. FO of the Tethyan Helvetoglobotruncana helvetica, 14. FO of Mammites nodosoides, 15. FO of the Western Interior H. helvetica. In the two sections, the Cenomanian-Turonian (C/T) boundary, as defined by the ammonite biostratigraphy, is placed within an interval about 50 cm thick. This interval is termed here as the C/T boundary "precision interval". The delta C-13 peak III slightly precedes the precision interval. The genus Anaticinella planktic foraminifer disappears in the middle part of this interval. The "filament event" occurs just above it and is coeval with the first occurrence of Turonian ammonites. These events are useful for placing the C/T boundary precision interval in absence of ammonite markers. |
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