Brèche du Collet des Rousses

Zurück zu Calcschistes du Petit St-Bernard

Darstellung und Status

Farbe CMYK
(0%,0%,0%,100%)
Rang
lithostratigraphische Formation
Gebrauch
Element ist in Gebrauch
Status
lokaler Begriff (informell)

Nomenklatur

Deutsch
Collet-des-Rousses-Konglomerat
Français
Brèche du Collet des Rousses
Historische Varianten
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)

Hierarchie und Abfolge

Alter

Alter Top
  • Mittlerer Jura
Bermerkungen zu Top
Dogger (Antoine 1971) or pre-Barremian (Loprieno 2001)
Alter Basis
  • Toarcien
Bermerkungen zu Basis
Late Liassic
Datierungsmethode
Bélemnites

Paläogeografie und Tektonik

Paläogeografie
Valais-Ozean
Tektonische Einheit (bzw. Überbegriff)

Referenzen

Neubearbeitung
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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