Bathonium

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system series step ≈ age ( mya )
higher higher higher younger
law Upper Jurassic Tithonium 145
⬍
152.1
Kimmeridgium 152.1
⬍
157.3
Oxfordium 157.3
⬍
163.5
Middle Jurassic Callovium 163.5
⬍
166.1
Bathonium 166.1
⬍
168.3
Bajocium 168.3
⬍
170.3
Aalenium 170.3
⬍
174.1
Lower Jurassic Toarcium 174.1
⬍
182.7
Pliensbachium 182.7
⬍
190.8
Sinemurium 190.8
⬍
199.3
Hettangium 199.3
⬍
201.3
deeper deeper deeper older

The Bathonian (also shortened to Bathon ) is in the geological the third chronostratigraphic stage of the Middle Jurassic series in Jura . It began geochronologically about 168.3 million years ago and ended about 166.1 million years ago and thus lasted about 2 million years. The bathonium is preceded by the bajocium ; it is followed by the callovium .

Naming and history

The type locality of the stage is near the city of Bath on the River Avon ( Somerset , England). The name Bathonium is a Latinized version of the city name. The name was first introduced in 1843 by Jean Baptiste Julien d'Omalius d'Halloy and adopted by Alcide Dessalines d'Orbigny in 1852. For the first time he defined the approximate extent of the step.

Definition and GSSP

The lower limit of the level is defined with the first onset of the ammonite species Parkinsonia (Gonolkites) convergens . The stage ends with the onset of the ammonite genus Kepplerites . A GSSP (type locality and type profile) has not yet been defined.

Breakdown

The bathonium can be divided into the sub-levels lower, middle and upper bathonium.

The bathonium in the Tethyalen area is divided into the following ammonite biozones:

Individual evidence

  1. ↑ Encyclopédia Universalis

literature

  • Jean Baptiste Julien d'Omalius d'Halloy: Précis élémentaire de géologie. 790 p., Bertrand, Paris 1843.
  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2005, ISBN 0-521-78673-8
  • Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278, Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .

Web links