Steig-Dolomitschotter
Back to Irchel-Schotter (s.s.)Representation and status
- Color CMYK
- (0%,16%,12%,16%)
- Color RGB
- R: 215 G: 180 B: 190
- Rank
- lithostratigraphic Formation
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Steig-Dolomitschotter
- Français
- Gravier du Steig
- Italiano
- Ghiaia del Steig
- English
- Steig Gravel
- Origin of the Name
-
Steig oberhalb von Dättlikon (ZH), östliche Ende des Irchels
- Historical Variants
-
Irchel-Dolomitschotter (Graf 1993), Steig-Schotter (Preusser et al. 2011)
Description
- Description
-
Graf 2000: Im SE des Irchel werden die älteren Schotter erosiv durch eine jüngere Schüttung abgeschnitten. Diese zeichnet sich durch eine Paläoströmung nach N und einen auffälligen Reichtum an Dolomitgeröllen aus (10-15%).
- Thickness
- Ca. 10 m.
Components
- dolomite
Hierarchy and sequence
- Units at roof
- Upper boundary
-
Hasli-Formation
- Lower boundary
-
Erosive Basis über Irchel-Schotter oder Molasse.
Age
- Age at top
-
- Early Pleistocene
- Age at base
-
- Early Pleistocene
Geography
- Geographical extent
- SE Hügel Irchel (ZH).
Palaenography and tectonic
-
- Höhere Deckenschotter
- Tectonic unit (resp. main category)
- Kind of protolith
-
- sedimentary
- Conditions of formation
-
Schüttung in N Richtung.
References
- Definition
-
(2011) :
Quaternary glaciation history of northern Switzerland. E&G Quaternary Science Journal 60/2-3, 282-305
p.285: The glaciofluvial gravel on top (‘Irchel-Schotter’) is cut by a channel-like structure in the SE. This channel is filled by younger glaciofluvial gravel (‘Steig-Schotter’) showing a prominent difference in petrography compared to the two older units. This implies that erosion was not a local phenomenon but rather indicates reorganisation of the entire drainage network. All over Irchel, the two previous units (‘Irchel-Schotter´, ´Steig-Schotter’) are covered by overbank and channel fill deposits of a meandering river system, with a thickness between 2 m and 7 m (‘Hasli-Formation’).