«Flysch Rosso»
Representation and status
- Color RGB
- R: 200 G: 180 B: 120
- Rank
- lithostratigraphic Formation
- Validity
- Unit is not in Use
- Status
- incorrect name (though informally used)
Nomenclature
- Deutsch
- «Flysch Rosso»
- Français
- «Flysch Rosso»
- Italiano
- «Flysch Rosso»
- English
- «Flysch Rosso»
- Historical Variants
-
Membro delle peliti rosse, Peliti Rosse, Flysch rosso (Venzo 1954, Bichsel & Häring 1981)
Description
- Thickness
- Max. 30 m; Max 120 m (Bichsel & Häring 1981)
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
Age
- Age at top
-
- Early Turonian
- Age at base
-
- Latest Cenomanian
Geography
- Geographical extent
- Lombardia centrale (Brianza, Bergamasco).
Palaenography and tectonic
-
- Südalpine Flysche
- Tectonic unit (resp. main category)
- Kind of protolith
-
- sedimentary
- Metamorphism
- non metamorphic
References
- Definition
- (1954) : Stratigrafia e tettonica del Flysch (Cretacico-Eocene) del Bergamasco e della Brianza occidentale. Mem. Descr. Carta Geol. Ital. 31, 123 pagine
- Definition
-
(1981) :
Facies evolution of Late Cretaceous flysch in Lombardy (northern Italy). Eclogae geol. Helv. 74/2, 383–420
p.389: The Flysch rosso is intercalated between the Scisti neri and the Pontida Formation. The sequence was first mentioned as Flysch rosso by Venzo (1954) and is synonymous with the Sommaschio Formation (Fernandez 1962, Gnaccolini 1968). This formation, with clear flysch characteristics, was considered of partly Cenomanian/partly Turonian age (Aubouin et al. 1970). Exposures of the Flysch
rosso are delimited to the Brianza and the western Bergamasco (sections 11, p. 400; 23, p. 404; 30, p. 406). The formation reaches a total thickness up to 120 m. It shows a succession of reddish or green and purple marls alternating with thin turbiditic sandstone layers (Tb, Tc). The fine to medium grained sand consists of lithic fragments with a considerable amount of quartz and mica. In the lowermost portion the sand/shale ratio increases over 50 m from 1:10 to 1:1. The turbiditic layers are arranged acyclically. Neglecting the high sand/shale ratio, the predominant turbidite type corresponds to the facies D2.