Kimmeridgium

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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
"Sea of ​​rocks" from Malm Epsilon in the Wental near Essingen .

The Kimmeridgian (in German often shortened to Kimmeridge , more rarely Kimmeridgien) is in the Earth's history , the average chronostratigraphic stage of the Upper Jurassic in the Jura . Geochronologically , the stage began about 157.3 million years ago and ended 152.1 million years ago. The Kimmeridgium follows the Oxfordium ; after the Kimmeridgium comes the tithonium .

Naming and history

The term "Kimmeridgien" was introduced by Jules Thurmann in 1832. It is the Latinized name of the town of Kimmeridge , on the Isle of Purbeck , in the county of Dorset on the English Channel coast of England .

Definition and GSSP

The stage begins with the layers in which the ammonite species Pictonia baylei appears for the first time . The end of the stage is defined with the onset of the ammonite Hybonoticeras hybonotum . The end of the stage also coincides with the M22An magnetic anomaly. A GSSP (global type locality and type profile) has not yet been defined.

Breakdown

The Kimmeridgium is subdivided in the Tethyalen area into seven ammonite biozones:

The Kimmeridgium is divided into the Lower and Upper Kimmeridgium.

Individual evidence

  1. ^ Geological dictionary, p. 111.

literature

  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2005 ISBN 978-0-521-78673-7
  • Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278, Enke Verlag, Stuttgart 1998 ISBN 3-432-84100-0 .
  • Jules Thurmann: Sur Les Soulèvemens Jurassiques Du Porrentruy: Description Géognostique de la Série Jurassique et Théorie Orographique du Soulèvement. Mémoires de la Société d'histoire naturelle de Strasbourg, 1: 1-84, FG Levrault, Paris 1832

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