«Blockhorizont» von Bernhardzell

Back to the list

Representation and status

Index
-
CMYK Color
N/A
RGB color
R: 250 G: 225 B: 225
Rank
lithostratigraphic Bed
Validity
Unit is in Use
Status
local name (informal)
SCS note
-
SCS date
-
Comment
Als westlichstes Äquivalent des deutschen «Brockhorizont» betrachtet (Bolliger 1994b und 1998a).

Nomenclature

German
«Blockhorizont» von Bernhardzell
French
-
Italian
-
English
-
Origin of the Name

Bernhardzell (SG)

Historical Variants
Blockhorizont (Hofmann 1951 und 1973, Kälin & Kempf 2009), vulkanischer Blockhorizont (Hofmann 1949 und 1956), Malmkalk-Blockhorizont, Blockhorizont of Bernhardzell (Letsch 2018)
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
-
Geomorphology
-
Thickness
10-15 cm (Letsch 2018)

Components

Lithological content
-
Mineral content
-
Fossil content
-

Hierarchy and succession

Superordinate unit
Subordinate units
Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

Age

Age at top
Langhian
Note about top
-
Age at base
Langhian
Note about base
-
Dating method
-

Geography

Geographical extent
Ostschweiz.
Type area
-
Type locality
  • Bernhardzell (SG), an der Sitter
    Site particularities
    • upper boundary
    • lower boundary
    • typical facies
    Site accessibility
    • river bed
    Coordinates
    • (2743140 / 1260530)
    Note
    • Hofmann 1951
Type profile
-
Reference profiles
-
Point of interest
  • Tüfentobel (SG)
    Site particularities
    • typical facies
    Coordinates
    • (2743535 / 1255305)

Paleogeography and tectonic

Paleogeography
-
Kind of protolith
  • volcano-sedimentary
Conditions of formation
Very distally located ejecta-layer resulting from the Ries meteorite impact (Hofmann 1973b, which caused the impact structures of the Nördlinger Ries and Steinheim craters in southern Germany (SHOEMAKER & CHAO 1961, HÜTTNER & SCHMIDT-KALER 1999).
Sequence
-
Tectonic Unit (resp. main category)
Plateau Molasse
Metamorphism
-
Metamorphic facies
-
Note on metamorphism
-

References

Definition
-
Revision
Kälin Daniel, Kempf Oliver (2009): High-resolution stratigraphy from the continental record of the Middle Miocene Northern Alpine Foreland Basin of Switzerland. , N. Jb. Geol. Paläont. Abh. 254/1-2, 177-235

HOFMANN (1951) described an exotic horizon within the OSM deposits of eastern Switzerland, which comprises angular Jurassic limestone blocks of Swabian lithofacies with a size of up to 20 cm, within greenish freshwater marl. Later, HOFMANN (1973b) identified this layer as a very distally located ejecta-layer resulting from the Ries meteorite impact, which caused the impact structures of the Nördlinger Ries and Steinheim craters in southern Germany (SHOEMAKER & CHAO 1961, HÜTTNER & SCHMIDT-KALER 1999). HOFMANN (1973b) also pictured typical, impact-related shatter-cone structures. Near Bischofszell, the Ries ejecta-layer is situated approx. 80-100 m below the Schoosstobel [= Leimbach] bentonite, and approx. 180-200 m below the Waldkirch/Mollen bentonite (Fig. 5). Numerical ages of the Ries meteorite impact range from 14.4–14.9 Ma (GENTNER & WAGNER 1969, STORZER et al. 1995, REICHENBACHER et al. 1998). A detailed discussion of these ages, however, is beyond the scope of our study since the age of the Ries impact is not crucial to our correlations.
Important publications
  • Letsch Dominik (2018): Diamictites and soft sediment deformation related to the Ries (ca. 14.9 Ma) meteorite impact: the "Blockhorizont" of Bernhardzell (Eastern Switzerland). , Int. J. Earth Sci. (Geol. Rundschau) 107, 1379-1380

Material and varia

Applications
-