Hornbuck-Member

Rappresentazione e statuto

Colore CMYK

siehe Villigen-Formation

Colore RGB

R: 180 G: 190 B: 210

Rango

Membro litostratigrafico (Sotto-formazione)

Uso

Unità in uso.

Status

termine formale valido

Discussione del statuto

Nomenclatura

Deutsch

Hornbuck-Member

Français

Membre du Hornbuck

Italiano

Membro del Hornbuck

English

Hornbuck Member

Origine del nome

Hügel Hornbuck (Deutschland), E Griessen / Klettgau [non: Hornbuck (AG) wo die Villigen-Fm. jedoch auch auftritt !]

Varianti storiche

Hornbuckschichten (Würtenberger & Würtenberger 1866), Hornbuckschichten (Hantke 1967), Hornbuck Member (Gygi 2000c)

Nota sul nome

Gygi (2000b: 133) schlägt Typus-Profil vor (Nordhang des Hornbuck, 675.850/276.220).

Descrizione

Descrizione

"Wechsellagerung von mergeligen Kalksteinen mit Mergeln. Die Kalksteine führen Kiesel-Schwämme" (Gygi 2000b: 134)

Potenza

Ca. 10 m (Gygi 2000c)

Componenti

• ammoniti
• spugne

Gerarchia e successione

Unità di rango superiore

• Villigen-Formation

Unità sovrastante

• Küssaburg-Member

Unità sottostante

• Effingen-Member

Limite superiore

Austreten der Schwämme und der mergeligen Zwischenlagen

Limite inferiore

Erste Schämme-Vorkommen über den mergeligen Effingen-Mb.

Età

Geomorfologia

• Oxfordiano

Osservazioni sul tetto

Bimammatum-Zone

Età alla base

• Oxfordiano

Osservazioni sulla base

Bimammatum-Zone, Berrense-Subzone

Metodo di datazione

Biostratigraphie: Ammoniten der Berrense- bis Bimammatum-Zone (Gygi 2000b/c)

Geografia

Estensione geografica

Klettgau, Randen-Gebiet.

Regione-tipo

Hornbuck, N von Riedern am Sand, Unterklettgau-Tal, Süddeutschland

Sezione-tipo

• Hornbuck (Deutschland)
  Caratteristiche del sito
  • Obergrenze
  • typische Fazies
  Agibilità del sito
  • Strassenanschnitt / Bahnanschnitt
  Coordinate
  • (2675850 / 1276220)
  Nota
  • Waldstrasse am Nordhang auf Kote 500 m (Gygi 1969 Pl.19 Profil RG76, Gygi 2000c S.133)

Paleogeografia e tettonica

• Malm (Jura)

Paleogeografia

Argovian Basin

Termini generici

• Jura :
  Juragebirge

Tipo di origine

• sedimentaria

Metamorfismo

non metamorfo

Referenze

Definizione

Würtenberger F. J., Würtenberger L. (1866) : Der Weisse Jura im Klettgau und angrenzenden Randengebirg. Verh. natw. Vereins Karlsruhe 2, 11-68

S.25

Revisione

Gygi R. A. (2000) : Annotated index of lithostratigraphic units currently used in the Upper Jurassic of northern Switzerland. Eclogae geol. Helv. 93/1, 125-146

p.133: Hornbuck Member (Würtenberger & Würtenberger 1866) ; Member of the Villigen Formation The name Hornbuck Member (Hornbuck-Schichten) was introduced by Würtenberger & Würtenberger (1866. p. 25). It refers to the hill called Hornbuck north of Riedern am Sand that belongs to the township of Erzingen in the Unterklettgau valley, southern Germany. Würtenberger & Würtenberger did not designate a type section, and Gygi (1969. Pl. 19) was not in a position to give a complete section of the member in the Klettgau valley or the Randen hills. The best outcrop of the member is section RG 76 along a forest road on the north slope of Hornbuck hill at coordinates 675.850/276.220 at the elevation of 500 m, LK 1051 Eglisau. This section can be desig-