Moskovium

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system Subsystem step ≈ age ( mya )
higher higher higher younger
Carbon Pennsylvania Gzhelium 298.9
⬍
303.7
Kasimovium 303.7
⬍
307
Moskovium 307
⬍
315.2
Bashkirium 315.2
⬍
323.2
Mississippium Serpukhovium 323.2
⬍
330.9
Visa 330.9
⬍
346.7
Tournaisium 346.7
⬍
358.9
deeper deeper deeper older

The Moskovian (English Moscovian ) is the second chronostratigraphic stage of the Pennsylvania ( carbon ) in the history of the earth . Expressed in absolute numbers ( geochronologically ), the stage represents the period from about 315.2 million years to about 307 million years. The Moskovium follows the Bashkirium and is replaced by the Kasimovium .

Naming and history

The Moskovium is named after Moscow , the capital of Russia. The stage and name were suggested by Sergei Nikitin in 1890.

Definition and GSSP

The base of the Moskoviums is through the first appearance of Conodonten -type Declinognathodus donetzianus and / or the type Conodonten Idiognathoides postsulcatus and the fusulinids -type Aljutovella aljutovica defined. The upper limit is close to the base of the obsoletes obsoletes - Protriticites pseudomontiparus - Fusulin zone, or the first appearance of the ammonite genus Parashumardites . A reference profile (Global Stratotype Section and Point, GSSP) for the base of the Moskovium has not yet been established.

Breakdown

The Moskovium is divided into five conodont biozones:

literature

  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2004, ISBN 0-521-78673-8 .
  • Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278 pages, Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .

Web links