See more from this Division: Topical Sessions
See more from this Session: Recoveries from Mass Extinction: Patterns, Processes, and Comparisons II
Abstract:
Conodonts crossed the PTB without major changes [3]. In the Early Triassic the first major conodont faunal turnover occurred during the late Griesbachian - early Dienerian, with the disappearance of Anchignathodontids (Hindeodus-Isarcicella group), which were replaced by the emergent Neospathodus and Borinella? species.
In the earliest Smithian, conodonts experienced a dramatic radiation, which ended in a major extinction during the late Smithian. This extinction was the most severe of the entire Triassic in terms of generic diversity and multi-element apparatuses. In the early Spathian conodonts radiated again explosively and gradually declined during late Spathian times.
These global diversity patterns coincide with large perturbations of the global carbon cycle [4-7]. As indicated by changes in the latitudinal gradient of generic richness of ammonoids [8], the boreal palynological record [6], and a prominent positive δ13C-isotope shift, the late Smithian - early Spathian boundary interval is marked by a severe climatic change.
[1] Galfetti, T. et al. 2007a: EPSL 258.
[2] Ovtcharova, M. et al. 2006: EPSL 243.
[3] Orchard, M. 2007: PPP 252.
[4] Brühwiler, T. et al. 2007b: SGM Geneva.
[5] Galfetti, T. et al. 2007b: PPP 243.
[6] Galfetti, T. et al. 2007c: Geology 35.
[7] Payne, J. et al. 2004: Science 5683.
[8] Brayard, A. et al. 2006: PPP 239.
See more from this Division: Topical Sessions
See more from this Session: Recoveries from Mass Extinction: Patterns, Processes, and Comparisons II