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Abstract
The different types of projections sent out by the puys of Montchal, of Montcineyre and the Pavin lake-crater are described and the areas that they cover are delimited. Notably the relations between the trachytic nuée surrounding the Pavin and the pumices in the vicinity of Montcineyre have been established. The projections can be dated by means of paleosols that they overlie. Lastly, the maar of les Costes furnishes a recapitulative tephrochronological section, thanks to the superposition of the following formations and intercalated paleosols bedded basaltic tuffs of the maar properly speaking, basaltic lapilli of Montcineyre (or Montchal) and the trachytic nuée of Lake Pavin. In the region of Champeix can be observed pumiceous alluvium of Middle Pleistocene age, the base of which presents a morainic character ; these were probably contemporary with the eruptions of the Adventif Massif. The route leading from the Perrier cemetery to the summit of the plateau offers a complete section of the Perner infilling : vestiges of inset terraces, the basalt of the Roca-Neyra, the Perrier conglomerate consisting of mud flows intercalated with beds of fluvial sands and pebbles, lying locally on volcano-sedimentary strata.
Published Version
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Schedule a callMore From: Bulletin de l'Association française pour l'étude du quaternaire
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