«Blockmergel» (Spirstock-Serie)

Representation and status

Color CMYK
(0%,0%,0%,100%)
Rank
lithostratigraphic unit
Validity
Unit is in Use
Status
incorrect name (though informally used)

Nomenclature

Deutsch
«Blockmergel» (Spirstock-Serie)
Français
«Blockmergel» (Série du Spirstock)
Italiano
«Blockmergel» (Serie dello Spirstock)
English
«Blockmergel» (Spirstock Series)
Historical Variants

Blockmergel (Arn. Heim 1928, Letsch & Kiefer 2017), Marnes à galets roulés de roches diverses (Jeannet & Leupold 1935), Blockmergeln des Spirstockes (Rutsch et al. 1966), Globigerinenmergel mit einsedimentierten Blöcken (Ochsner 1975), "Blockmeregel" am Spirstock (Bayer 1982)

Nomenclatorial Remarks

siehe auch Rollier 1920, Jeannet 1935, 1939 und 1941, Frei 1963

Description

Description

Marnes grisâtres ou brunâtres un peu gréseuses à délits conchoïdaux, contenant des galets de nature variée (Crétacé et Tertiaire de l'Helvétique) pouvant atteindre 1 m de long.

Thickness
40-60 m (Letsch & Kiefer 2017)

Hierarchy and sequence

Units at roof

Age

Age at top
  • Eocene
Age at base
  • Eocene

Geography

Geographical extent
Spirstock, Laucherentobel.
Point of interest
  • Herrenbach = Ruestelbach (SZ)
    Site particularities
    • typische Fazies
    Site accessibility
    • Bachprofil
    Coordinates
    • (2712300 / 1219280)
    Note
    • Ochsner 1975 S.56
  • Bächweidbach (SZ)
    Site particularities
    • typische Fazies
    Site accessibility
    • Bachprofil
    Coordinates
    • (2712150 / 1219850)
    Note
    • Ochsner 1975 S.57

Palaenography and tectonic

  • Paleogene of the Helvetics
Paleogeography
South Helvetic Domain
Tectonic unit (resp. main category)
Conditions of formation

The Blockmergel are interpreted as the product of gravitational deposition of single blocks across steep palaeo-slopes (subaqueous rockfall) into a basin otherwise dominated by suspension settling sedimentation (Letsch & Kiefer 2017).

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