strati.ch - Lexique lithostratigraphique de la Suisse

Représentation et statut

Variantes historiques: --- ([Issel 1893, Spitz 1919, Novarese 1929, Baggio 1965a/b, Elter et al. 1966, Ahrendt 1972, Wozniak, 1977), Triassic dolostone (Biino & Compagnoni 1989), dolomitic limestone (Borghi et al. 1996)

Âge au sommet

Âge à la base

Révision: Biino G., Compagnoni R. (1989) : The Canavese Zone between the Serra d*Ivrea and the Dora Baltea River (Western Alps). Eclogae geol. Helv. 82/2, 413-417

p.421: The oldest members of the Mesozoic cover are dolomitic limestones, which are

whitish-grey, rarely pinkish, in colour and locally contain darker grey interlayers. In

some places there are structures suggesting both bioturbation and dessication, and

remnants of foraminifera and Dasycladaceae were described by Wozniak (1977) and

Biino (1985). The dolomitic limestones were considered as Middle Triassic in age by

Issel (1893), Parona (1924) and Elter et al. (1966), and Upper Triassic by Baggio

(1965) and Ahrendt (1972). Sturani (1975, p. 165), though favouring a Middle

Triassic age, reports the presence of dolostones with a Norian "Hauptdolomit" facies.

The top of the dolomitic limestone is marked by an irregular erosional surface,

which is covered by a fine-grained pinkish to pinkish-violet calcarenite to calcirudite

limestone.