Barremium

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system series step ≈ age ( mya )
higher higher higher younger
chalk Upper Chalk Maastrichtium 66
⬍
72
Campanium 72
⬍
83.6
Santonium 83.6
⬍
86.3
Coniacium 86.3
⬍
89.7
Turonium 89.7
⬍
93.9
Cenomanium 93.9
⬍
100.5
Lower Cretaceous Albium 100.5
⬍
112.9
Aptium 112.9
⬍
126.3
Barremium 126.3
⬍
130.7
Skin rivium 130.7
⬍
133.9
Valanginium 133.9
⬍
139.3
Berriasium 139.3
⬍
145
deeper deeper deeper older
Emericiceras emerici - Barremium - Museum of Toulouse

The Barremium (in German usage often shortened to Barrême ) is a chronostratigraphic level of the Lower Cretaceous in the history of the earth . In absolute numbers ( geochronologically ) the stage covers the period from about 130.7 to about 126.3 million years. The Barremium follows the Hauterivium and is replaced by the Aptium .

Naming and history

The original type locality for the level is near the place Barrême ( Département Alpes-de-Haute-Provence , France). Henri Coquand suggested the stage and name in 1873.

Definition and GSSP

The stage begins with the first onset of the ammonite species Spitidiscus hugii and ends with the magnetic anomaly M0 . A GSSP (global type locality and type profile) has not yet been finalized.

Breakdown

To further subdivide the level, eleven ammonite biozones have been separated out in the Tethys area .

literature

  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2004 ISBN 978-0-521-78673-7
  • Hans Murawski, Wilhelm Meyer: Geological dictionary . 10th revised and expanded edition. Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 ( Enke paperback ).

Web links