This paper deals with the zonal paleontological sequence of the uppermost Jurassic and lower Cretaceous strata on the strength of the Argentine ammonite fauna. Some misleading interpretations regarding the so-called Spiliceras damesi and Parodontoceras callistoides zones are pointed out, and some significant species actually found in them are discussed. Thus evidence is provided toward clarification of several interpretations formerly advanced about the Upper Jurassic boundary as a whole.

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