Albium

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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

The Albium (in German usage often also shortened to Alb, rarely also Albien) is the name of a chronostratigraphic level in the highest Lower Cretaceous in geological history . The geochronological period extends from about 112.9 to about 100.5 million years ago. The Albium follows the Aptium and is replaced by the Cenomanium .

Naming and history

The stage was proposed by Alcide Dessalines d'Orbigny in 1842 and named after the French river Aube (Latin Albia). The identity of the geological level Alb (ium) and the region names Swabian Alb and Franconian Alb is a coincidence.

Definition and GSSP

The base of the stage is defined by the first appearance of the coccolithophore species Praediscosphaera columnata , the end of the stage by the first appearance of the foraminifera species Rotalipora globotruncanoides . A GSSP (global type locality and type profile) was established in 2016.

Breakdown

For the Albium, the lower, middle and upper Albium levels are shown.

Regionally, the Albium is also subdivided into the lower levels Gaultium and Vraconium.

Rocks of the Alb in Germany

A typical marine rock formation in Germany is the flame marl, for example in the area of ​​the Sack-Mulde in the south of Lower Saxony.

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 . 10., rework. u. exp. Ed., 278 pages, Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .

Web links