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

Irchel-Schotter (s.s.)

Français

Gravier de l'Irchel (s.s.)

Italiano

Ghiaia dell'Irchel (s.s.)

English

Irchel Gravel (s.s.)

Origin of the Name

Hügel Irchel nordöstlich Bülach (ZH)

Historical Variants

Mittlere Irchelschotter (Graf 1993), Irchel-Schotter (Preuss et al. 2011)

Description

Thickness

Rund 40 m.

Hierarchy and sequence

Units at roof

• Hasli-Formation
• Steig-Dolomitschotter

Upper boundary

Hasli-Formation, lokal Steig-Schotter.

Age

Age at top

• Early Pleistocene

Age at base

• Early Pleistocene

Geography

Geographical extent

Hügel Irchel (ZH).

Palaenography and tectonic

• Höhere Deckenschotter

Tectonic unit (resp. main category)

• Höhere Deckenschotter

Kind of protolith

• sedimentary

Conditions of formation

Schüttung in NW Richtung.

References

Definition

Preusser Frank, Graf Hans Rudolf, Keller Oskar, Krayss Edgar, Schlüchter Christian (2011) : Quaternary glaciation history of northern Switzerland. E&G Quaternary Science Journal 60/2-3, 282-305

p.285: The glaciofluvial gravel on top [of the Langacher-Schotter] (‘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’).