Brèche du Collet des Rousses

Rappresentazione e statuto

Colore CMYK

(0%,0%,0%,100%)

Rango

Formazione litostratigrafica

Uso

Unità in uso.

Status

termine locale (informale)

Nomenclatura

Deutsch

Collet-des-Rousses-Konglomerat

Français

Brèche du Collet des Rousses

Varianti storiche

Brèche du Collet des Rousses (Loubat 1968 et 1975, Antoine 1971, Fügenschuh et al. 1999, Loprieno 2001), Collet des Rousses conglomerate (Masson et al. 2008)

Gerarchia e successione

Unità sovrastante

• Formation de l'Aroley

Età

Geomorfologia

• Giurassico Medio

Osservazioni sul tetto

Dogger (Antoine 1971) or pre-Barremian (Loprieno 2001)

Età alla base

• Toarciano

Osservazioni sulla base

Late Liassic

Metodo di datazione

Bélemnites

Paleogeografia e tettonica

Paleogeografia

bacino Vallesano

Termini generici

• Sion-Courmayeur

Referenze

Revisione

Masson Henri, Bussy François, Eichenberger Marc, Giroud Niels, Meilhac Caroline, Presniakov Sergei (2008) : Early Carboniferous age of the Versoyen ophiolites and consequences: non-existence of a “Valais ocean” (Lower Penninic, western Alps). Bull. Soc. géol. Fr. 179/4, 337-355

p.341: The base of the calcschists is often characterized by one or several dm- to dam-thick layers of conglomerate, first described by Schoeller [1929] and called by Loubat [1968] and Antoine [1971] the “Collet des Rousses conglomerate”. They are formed by rounded or angular, poorly sorted, cm to dm-large pebbles, mainly limestones, in an abundant matrix that varies from a calcareous sandstone to a sandy limestone. They represent debris flows and gradually pass upwards to the normal PSB calcschists by decreasing abundance and granulometry of the detrital content. These basal layers also contain Liassic belemnites.