Irchel-Schotter (s.s.)

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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

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)
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’).

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