Brèche du Collet des Rousses

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Représentation et statut

Couleur CMYK
(0%,0%,0%,100%)
Rang
Formation lithostratigraphique
Usage
Ce terme est en usage.
Status
terme local (informel)

Nomenclature

Deutsch
Collet-des-Rousses-Konglomerat
Français
Brèche du Collet des Rousses
Variantes historiques
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)

Hiérarchie et succession

Unités sus-jacentes

Âge

Âge au sommet
  • Jurassique Moyen
Note sur le sommet
Dogger (Antoine 1971) or pre-Barremian (Loprieno 2001)
Âge à la base
  • Toarcien
Note sur la base
Late Liassic
Méthode de datation
Bélemnites

Paléogéographie et tectonique

Paléogéographie
bassin valaisan
Termes génériques

Références

Révision
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.
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