THE ORDOVICIAN CONODONT TRIPODUS LAEVIS BRADSHAW, 1969: ITS TAXONOMIC VALIDITY AND BIOSTRATIGRAPHIC VALUE IN THE ARGENTINE PRECORDILLERA
DOI:
https://doi.org/10.5710/PEAPA.09.04.2024.489Keywords:
Dapingian, Conodont, Argentina, PrecordilleraAbstract
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 that T. laevis or specimens assignable to this species span 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 indicating the lower boundary of the Dapingian stage. Based on this analysis, we propose that T. laevis sensu lato (s. l.) should not be considered a valid species and to avoid using this species for the Argentine Precordillera. Therefore, we suggest discontinuing the first appearance datum 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 using a new Dapingian conodont biostratigraphic chart for the Argentine Precordillera.
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