Lo Valvo, Gerardo A.; Herrera Sánchez, Nexxys C.; Toro, Blanca A. (2020-07)
The updated taxonomic revision of the Early–Middle Ordovician graptolites from the eastern Argentine Puna allows describing Sigmagraptus praecursor, Baltograptus extremus, B. geometricus, B. vacillans, Cymatograptus
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