Megabed di Missaglia

Back to the list

Representation and status

Index
-
CMYK Color
-
RGB color
-
Rank
lithostratigraphic Bed
Validity
Unit is in Use
Status
local name (informal)
SCS note
-
SCS date
-
Comment
-

Nomenclature

German
Missaglia-Megabed
French
Mégabed de Missaglia
Italian
Megabed di Missaglia
English
Missaglia Megabed
Origin of the Name
Missaglia (Italia)
Historical Variants
Missaglia Megabed = Megabed di Missaglia (Bernoulli et al. 1981)
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
-
Geomorphology
-
Thickness
25-30 m

Components

Lithological content
-
Mineral content
-
Fossil content
-

Hierarchy and succession

Superordinate unit
Subordinate units
Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

Age

Age at top
-
Note about top
-
Age at base
-
Note about base
-
Dating method
-

Geography

Geographical extent
-
Type area
-
Type locality
-
Type profile
-
Reference profiles
-
Point of interest
-

Paleogeography and tectonic

Paleogeography
Lombardy Basin,
Kind of protolith
-
Conditions of formation
-
Sequence
-
Tectonic Unit (resp. main category)
South Alpine
  • Canavese zone
  • Ivrea-Verbano zone
  • Strona-Ceneri Zone
  • Val Colla Zone
  • Tertiary Po Basin
Metamorphism
-
Metamorphic facies
-
Note on metamorphism
-

References

Definition
Bernoulli Daniel, Bichsel M., Bolli H.M., Haering M.O., Hochuli P.A., Kleboth P. (1981): The Missaglia megabed, a catastrophic deposit in the Upper Cretaceous Bergamo Flysch, northern Italy. , Eclog. Geol. Helv. 74/2, 421–442

p.421: The thickest of these intervals, the Missaglia Megabed. is intercalated into the Upper Santonian-Campanian Bergamo Flysch and can be traced over at least 12. presumably over 25 km. It overlies 6 m of pebbly mudstone with plastically deformed slabs of basinal marls of Aptian to Middle Cenomanian age, of turbiditic flysch sandstones and of cobbles and boulders of Liassic shallow-water and Cretaceous pelagic limestones set in a fluidally deformed silty matrix. The megabed itself consists of a 1 m thick basal conglomerate grading upwards into 25-30 m of coarse-tail graded calcarenite. calcisiltite and marlstone. In contrast to the terrigenous turbidites of the Lombardian Flysch, the Missaglia Megabed mainly contains along its base fragments of Upper Cretaceous pelagic limestones, of Jurassic shallow-water and pelagic limestones the same as in the sequence of the Trento Plateau, and. in the arenitic-pelitic interval, size-sorted tests of planktic foraminifera of Albian to Early Campanian age. quartz grains, bioclastic silt and redeposited coccolith ooze. The source area of the megabed is thus thought to have been a submerged high, possibly the Trento Plateau to the east and the emplacement of the catastrophic deposit is seen in connection with synsedimentary tectonics along the boundary faults which confined the Lombardian Basin during the Late Cretaceous. The sediment volume displaced by the Missaglia event must be larger than 4 km3 and probably exceeds 20 km3.
Revision
-
Important publications
-

Material and varia

Applications
-