Scaglia Rossa Lombarda

Représentation et statut

Index

c8

Couleur CMYK

40 / 0 / 60 / 0

Couleur RGB

R: 160 G: 210 B: 140

Rang

Formation lithostratigraphique

Usage

Ce terme est en usage.

Status

terme informel

Nomenclature

Deutsch

Scaglia Rossa Lombarda

Français

Scaglia Rossa Lombarda

Italiano

Scaglia Rossa Lombarda

English

Red Lombardian Scaglia

Variantes historiques

Scaglia Rossa (Vonderschmitt 1940, Venzo 1954, Stockar 2003, Carcano et al. 2007), Rote Scaglia (Vonderschmitt 1941), Red Scaglia (Bitterli 1965), Scaglia rossa (Bichsel & Häring 1981, Oppizzi & Spinedi 2007), Formazione di Sorisole (Bersezio et al. 1990), Scaglia Rossa Lombarda (Bernoulli et al. 2018), Marne e calcareniti rosse

Remarques nomenclatoriales

Corrisponde alla Formazione di Sorisole (Bersezio et al. 1990)

Links

Synonymes

Formazione di Sorisole

Description

Épaisseur

40 m (Carcano et al. 2007)

Composants

• foraminifères
• radiolaires

Globigerinen, Radiolarien, Globotruncanen (Gl. appenninica Renz)

Hiérarchie et succession

Unités sus-jacentes

• Gruppo del Flysch Lombardo
• Flysch del Varesotto

Unités sous-jacentes

• Scaglia Bianca Lombarda

Âge

Âge au sommet

• Cénomanien tardif

Note sur le sommet

Rotalipora greenhornensis Morrow = Late Cenomanian

Âge à la base

• Cénomanien précoce

Géographie

Extension géographique

Lombardia nord-occidentale e Ticino (Varesotto, Mendrisiotto).

Paléogéographie et tectonique

• Kreide des Südalpins

Termes génériques

• South Alpine

Type de protolithe

• sédimentaire

Conditions de formation

open-marine (pelagic), quiet environment

Métamorphisme

non métamorphique

Références

Définition

Vonderschmitt Louis (1941) : Bericht über die Exkursion der Schweizerischen Geologischen Gesellschaft in den Süd-Tessin. Eclogae geol. Helv. 33/2 (1940), 205-219

Révision

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

p.388: In western Lombardy (Varesotto, Brianza, Bergamasco), the Scaglia rossa is restricted to the Cenomanian. In the Varesotto the Scaglia rossa overlies the Scaglia bianca (Lower Cenomanian, Luterbacher 1965) and is followed by the Varesotto Flysch dated as Upper Cenomanian (Luterbacher 1965, Sames 1970). In an abandoned quarry northeast of Gropello (northern Lago di Varese) the Scaglia rossa is well exposed. It mainly consists of knobby weathering red marls. Few cm-thick, dark and light-grey layers are intercalated. The single layers are of great lateral continuity. The carbonate content ranges from 27% to 77%. The carbonate-rich layers display structures of resedimentation in the silty to pelitic material. Sedimentary structures are largely obliterated by burrowing (e.g. Chondrites). The red marls contain a rich planktonic microfauna. The top is dated as Late Cenomanian by Rotalipora greenhornensis Morrow. In the Brianza and the Bergamasco the Scaglia rossa overlies the Sasso della Luna. It is followed by the Scisti neri superiori of Late Cenomanian age (Guillot 1967, Vicente 1966) in the Brianza and is directly overlain by the Sarnico Sandstone of Early Turonian age in the eastern
Bergamasco.