Regalia formation

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Lithostratigraphy of the South German Jura .
Abbreviations:
  • Humph.-Fm. = Humphriesioolite Formation
  • L.Bk-Fm = Lying bench lime formation
  • H.Bk-Fm = hanging bank lime formation
  • Zm-Fm = cement marl formation
  • S.-Fm = Solnhofen formation
  • Rö.-Fm = Rögling formation
  • U.-Fm = Usseltal formation
  • Mö.-Fm = Mörnshein formation
  • N.-Fm = Neuburg formation
  • R.-Fm = Rennertshofen formation

    • The Ornate Clay Formation (previously only Ornate Clay) is a lithostratigraphic rock formation of the South German Jura and the North German Dogger Group. It is underlain in southern Germany by the Varians Marl Formation , and regionally differently overlaid by the Kandern Formation and the Impressamergel Formation . In the Wutach area it is replaced by the Wutach formation. It reaches a thickness of up to 50 m and is dated to the higher callovium . The upper limit is somewhat diachronic , however .

    History and naming

    The regalia formation of the southern German Jura was proposed by Gert Bloos, Gerd Dietl and Günter Schweigert in 2005. The name already goes to Friedrich August Quenstedt , who called this section of the southern German Jura in 1857 "Ornatenthon". The Ornatenton formation is named after the ammonite Ammonites ornatus von Schlotheim (today Kosmoceras ornatum ). Quenstedt understood something different than the first author von Schlotheim; he applied the name to different species of the genus Kosmoceras . A type locality, as it is actually required to define a lithostratigraphic unit, has not yet been determined.

    Definition and distribution area

    The ornate clay formation in the southern German Jura consists mainly of claystones with some embedded Eisenoolite banks (Macrocephalen and Anceps oolite), glauconitic sandstones and a horizon with calcareous concretions (Lamberti tubers). The thickness varies in the Swabian Alb area from a few meters to around 50 m in the Plettenberg area. The distribution area extends from the Ostalb to the Rhine Valley. In the Wutach area it is replaced by the Wutach formation. This area of ​​facies extends further into Switzerland, where it is known as the "Argovian" facies. Further east in the Franconian Alb, it interlocks with the Sengenthal formation. The lower limit is formed by the lower edge of the Macrocephalenooliths, the upper limit lies above the horizon of the Lamberti tubers and the change in color to the imprint gel formation.

    Temporal scope and breakdown

    The sediments of the Ornate Clay Formation were deposited during the Upper Bathonian and predominantly during the Callovian . The regalia formation extends locally into the lower Oxfordium . The ornate clay formation includes a maximum of nine ammonite zones: Clydoniceras discus , Bullatimorphies bullatus , Macrocephalites gracilis , Reineckeia anceps , Erymnoceras coronatum , Peltoceras athleta , Quenstedtoceras lamberti , Quenstedtoceras mariae and probably also Cardatumioceras cordatumi .

    The ornate clay formation is divided into three subformations: the macrocephalic subformation, the ornate clay subformation and the glauconite marl subformation.

    The Ornatenton-Formation in the North German Dogger group

    As early as 1993, Eckhard Mönnig had proposed a regalia formation in the North German Dogger group, which differs somewhat in its demarcation and chronostratigraphic range from the regalia formation in the southern German Jura. The lithological sequence within this formation also differs somewhat from the ornate clay formation of the southern German Jura. It remains to be seen whether the regalia formation of the North German Dogger Group and the southern German Jura were really deposited in a uniform sedimentation area (and rightly have the same name) or whether one of the two regalia formations has to be renamed. The above description only refers to the regalia formation of the southern German Jura.

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    literature

    • Gert Bloos, Gerd Dietl, Günter Schweigert: The Jura of Southern Germany in the Stratigraphic Table of Germany 2002. In: Newsletters on Stratigraphy. Vol. 41, No. 1/3, 2005, ISSN  0078-0421 , pp. 263-277.
    • Eckhard Mönnig: The regalia formation in northwest Germany. In: Newsletters on Stratigraphy. Vol. 28, No. 2/3, 1993, ISSN  0078-0421 , pp. 131-150.
    • Friedrich August Quenstedt: The Jura. Laupp Publishing House, Tübingen 1856–1857.

    Online source

    • Eckhard Mönnig: Ornatenton-Formation (in Northern Germany) . In LithoLex (online database). Hanover: BGR. Last update: August 29, 2006, Record ID: 4012001, accessed online May 17, 2009.

    Web links