Namurian

System	Series (NW Europe)	Stage (NW Europe)	Series (ICS)	Stage (ICS)	Age (Ma)
Permian					younger
Carboniferous	Silesian	Stephanian	Pennsylvanian	Gzhelian	298.9–303.7
		Stephanian		Kasimovian	303.7–307.0
		Westphalian		Moscovian	307.0–315.2
		Westphalian		Bashkirian	315.2–323.2
		Namurian		Bashkirian	315.2–323.2
		Namurian	Mississippian	Serpukhovian	323.2–330.9
	Dinantian	Visean		Visean	330.9–346.7
	Dinantian	Tournaisian		Tournaisian	346.7–358.9
Devonian					older
Subdivisions of the Carboniferous system in Europe compared with the official ICS-stages (as of 2018)

The Namurian is a stage in the regional stratigraphy of northwest Europe, with an age between roughly 331 and 319 Ma (million years ago). It is a subdivision of the Carboniferous system or period, as well as the regional Silesian series. The Namurian is named for the Belgian city and province of Namur where strata of this age occur (part of the Belgian Coal Measures). The Millstone Grit Group in the lithostratigraphy of northern England and parts of Wales is also of Namurian age.

The Namurian age lasted from 331 to 319 million years ago. It is preceded by the Visean stage/age (which corresponds to the upper Carboniferous Limestone of Great Britain) and succeeded by the Westphalian stage/age (which corresponds to the lower and middle Coal Measures of Great Britain).

In the official geologic timescale of the International Commission on Stratigraphy (ICS), the Namurian straddles the boundary between the Mississippian subperiod (359-323 Ma) and the Pennsylvanian subperiod (323-299 Ma).^[1] The upper part of the (regionally defined) Namurian stage corresponds to the (internationally used) Bashkirian stage whilst the lower part is assigned to the preceding Serpukhovian stage.^[1] Frequent references appear in scientific literature to a Namurian epoch or Namurian series, reflecting the stage's earlier status.

Stratigraphy

Substages, from youngest to oldest:^[2]^[1]

Yeadonian
Marsdenian
Kinderscoutian
Alportian
Chokierian
Arnsbergian
Pendleian

The boundary between the global Serpukhovian and Bashkirian stages (and thus the Mississippian and Pennsylvanian subperiods) occurs within the Chokierian substage.^[2]^[1]

References

^ ^a ^b ^c ^d Aretz, M.; Herbig, H.G.; Wang, X.D.; Gradstein, F.M.; Agterberg, F.P.; Ogg, J.G. (2020), "The Carboniferous Period", Geologic Time Scale 2020, Elsevier, pp. 811–874, doi:10.1016/b978-0-12-824360-2.00023-1, ISBN 978-0-12-824360-2
^ ^a ^b Waters, C.N. (2011-07-13), Waters, C.N.; Somerville, I.D.; Jones, N.S.; Cleal, C.J. (eds.), "Definitions of chronostratigraphic subdivisions: geochronology and event stratigraphy", A Revised Correlation of Carboniferous Rocks in the British Isles (First ed.), The Geological Society of London, pp. 3–10, doi:10.1144/sr26.2, ISBN 978-1-86239-694-4

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[:1-1] Aretz, M.; Herbig, H.G.; Wang, X.D.; Gradstein, F.M.; Agterberg, F.P.; Ogg, J.G. (2020), "The Carboniferous Period", Geologic Time Scale 2020, Elsevier, pp. 811–874, doi:10.1016/b978-0-12-824360-2.00023-1, ISBN 978-0-12-824360-2

[:0-2] Waters, C.N. (2011-07-13), Waters, C.N.; Somerville, I.D.; Jones, N.S.; Cleal, C.J. (eds.), "Definitions of chronostratigraphic subdivisions: geochronology and event stratigraphy", A Revised Correlation of Carboniferous Rocks in the British Isles (First ed.), The Geological Society of London, pp. 3–10, doi:10.1144/sr26.2, ISBN 978-1-86239-694-4

[1]

[2]