The current Triassic chronostratigraphic scale is a hierarchy of three series divided into seven stages, divided further into 15 substages. Ammonoid and conodont biostratigraphies provide the primary basis for chronostratigraphic definition based on global stratotype sections and points (GSSP). I propose that Triassic chronostratigraphic definition should rely entirely on ammonoid biochronologi...

The “Carnian Crisis” is documented in basinal, shallow-marine and epicontinental northwestern Tethyan facies areas by, successively, (1) a demise of carbonate platforms and reefs in the Julian 1/IIc, (2) a major faunal and floral turnover in the Late Julian and (3) a significant extinction event affecting conodonts and ammonoids at the Julian/Tuvalian boundary. Based on the study of 19 successi...

ECOS III The slender, spine-shaped, apatitic protoconodonts appear in the fossil record near the Precambrian-Cambrian boundary and persist through the Cambrian . Recent work (Szaniawski 1 982, J. Paleont. 56) suggests that protoconodont elements were homologous to the grasping spines of modern chaetognaths . Paraconodonts are similar to protoconodonts in their mode of growth by basal accretion ...

This contribution contains the 3D models of set Famennian conodont elements belonging to species Polygnathus glaber and communis analyzed in following publication: Renaud et al. 2021: Patterns bilateral asymmetry allometry Late Devonian Polygnathus. Palaeontology,

Most of the Frasnian regional stages Ukhta region, South Timan, Russia, are composed basinal deposits, however, hassi and jamieae zones Standard Conodont Zonation cannot be easily recognised in this region. A revision previously elaborated succession Timan-Pechora associations revealed that correlation problems connected with taxonomic interpretation zonal species Palmatolepis . Analysis conodo...