strati.ch - Lessico lithostratigrafico della Svizzera

Rappresentazione e statuto

Varianti storiche: Scisti neri superiori (Aubouin et al. 1970), Scisti neri (Bichsel & Häring 1981), Peliti Nere Superiori (Bersezio et al. 2001)

Unità di rango superiore

Unità sovrastante

Unità sottostante

Geomorfologia

Età alla base

Osservazioni sulla base

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Termini generici

Tipo di origine

Definizione: Aubouin J., Sigal J., Berland J.P., Blanchet R., Bonneau M., Cadet J.P., Guillot P.L., Lacour A., Piat B. Vicente J.C. (1970) : Sur un bassin de flysch : stratigraphie et paléogéographie des flysch crétacés de la Lombardie (versant sud des Alpes orientales, Italie). Bull. Soc. Géol. France 12/4, 612–658

Revisione: Bichsel Matthias, Häring Markus O. (1981) : Facies evolution of Late Cretaceous flysch in Lombardy (northern Italy). Eclogae geol. Helv. 74/2, 383–420

p.389: The Scisti neri described here correspond to the Scisti neri superiori as defined by Aubouin et al. (1970), which were dated by these authors as Late Cenomanian by Rotalipora cushmani (Morrow). The Scisti neri are best exposed in a drainage ditch below the quarry of Cesana (section 11, p. 400; Fig. 1, D). Thin-bedded red and grey calcareous marls alternate with red and purple marls. The formation takes its name from occasional intercalations of black pelitic intervals. These bituminous layers range from a few to some ten centimeters in thickness. Deposition of the Scisti neri coincides with an oceanic anoxic event, which is reported worldwide during the Late Cenomanian-Early Turonian (Arthur & Schlanger 1979). The frequency of thin-bedded sandstone layers increases towards the top of the formation. These beds mark the transition to the overlying Flysch rosso. The only difference to the underlying Scaglia rossa are the intercalated bituminous shales. The red color of the marls is characteristic for all three formations.