Analysis of discrepancies between the chronological partitions proposed by the present writer (mammalian faunal units) and by French students (biozones)| discussion of the stratigraphic principles involved.
The mammalian fauna of the lower Couze Pavin and Chambon rivers are the classical references for biostratigraphic scale of the Villafranchian and post-Villafranchian times in the Southern France. A stratigraphic revision of volcanic episodes