INVESTIGADORES
MESTRE GARCIA Ana Isabel
artículos
Título:
THE ORDOVICIAN CONODONT TRIPODUS LAEVIS BRADSHAW: ITS TAXONOMIC VALIDITY AND BIOSTRATIGRAPHIC VALUE IN THE ARGENTINE PRECORDILLERA
Autor/es:
MESTRE, A.; MORENO, F.; HEREDIA, S.
Revista:
Publicación Electrónica de la Asociación Paleontológica Argentina
Editorial:
Asociación Paleontológica Argentina
Referencias:
Año: 2024
ISSN:
2469-0228
Resumen:
The conodont species Tripodus laevis has been used as an index conodont to mark the lower boundary of the Middle Ordovician in the Midcontinent and Precordillera conodont biostratigraphic charts, despite the T. laevis or specimens assignable to this species spanning from lower Floian to middle Darriwilian. Also, this conodont species has a complex taxonomic history. It has been located in different conodont families and its apparatus has been composed of varying conodont morphotypes. In the present contribution, we conducted a critical revision of the taxonomic history of T. laevis, as well as its biostratigraphic value as a key species for pointing out the lower boundary of the Dapingian stage. Based on this analysis we propose that T. laevis s.l. should not be considered a valid species and avoid using this species in the Precordillera. Therefore, we suggest discontinuing the FAD of T. laevis s.l as a marker for the lower boundary of the Middle Ordovician in this region. In light of this proposal, we suggest the usage of a new Dapingian conodont biostratigraphic chart for the Precordillera.
