Hasli-Formation

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

Hasli-Formation

Français

Formation de Hasli

Italiano

Formazione di Hasli

English

Hasli Formation

Origin of the Name

Hasli am SE Hügel Irchel (ZH)

Historical Variants

Überschwemmungsablagerungen (Graf 1993, Bolliger et al. 1996), Schwemmebenen-Ablagerungen (Graf 2000), Hasli-Formation (Preuss et al. 2011)

Description

Description

Preusser et al. 2011 p.285: 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’). These deposits document a phase of warm environmental conditions of a flood plain. The overbank deposits bear land snails and, of particular importance, vertebrate remains. The presence of Mimomys cf. pliocaenicus, M. reidi/pitymyoides, Borsodia, and Lagurodon, together with the absence of Microtus, is interpreted to indicate a correlation with Mammalian Neogen zone (MN) 17 (Gelasian), representing an age of 2.6–1.8 Ma (Bolliger et al. 1996).

Thickness

2-7 m (Preuss et al. 2011) ; ca. 4 m (Bolliger et al. 1996).

Components

• vertebrates
• gastropods

Hierarchy and sequence

Subordinate units

• Fossilhorizont Irchel-Hasli

Units at roof

• Forenirchel-Schotter

Upper boundary

Forenirchel-Schotter.

Lower boundary

Irchel-Schotter s.s. im NW, Steig-Dolomitschotter im SE.

Age

Age at top

• Gelasian

Note about top

MN17

Age at base

• Gelasian

Note about base

MN17

Dating Method

Kleinsäuger-Fauna und Magnetostratigraphie (Bolliger et al. 1996, Preusser et al. 2011).

Geography

Geographical extent

Hügel Irchel (ZH).

Palaenography and tectonic

• Höhere Deckenschotter

Tectonic unit (resp. main category)

• Höhere Deckenschotter

Kind of protolith

• sedimentary

References

Definition

Graf Hans Rudolf (1993) : Die Deckenschotter der zentralen Nordschweiz. Diss. ETH Zürich Nr.10205

Definition

Thew Nigel, Kälin Daniel, Cuenca-Bescos Gloria, Buechi Marius W., Penkman Kirsty, Scheidt Stephanie, Knipping Maria, Maier Fabian, Urresti Isabel, Deplazes Gaudenz (2024) : The Hasli Formation of the Irchel Plateau – A key record for older Early Pleistocene interglacial sediments in northern Switzerland. Quaternary Science Reviews 332

Important Publications

Bolliger Thomas, Fejfar Oldrich, Graf Hansruedi, Kälin Daniel (1996) : Vorläufige Mitteilung über Funde von pliozänen Kleinsäugern aus den höheren Deckenschottern des Irchels (Kt. Zürich). Eclogae geol. Helv. 89/3, 1043-1048