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

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

^
ISBN 978-0-12-824360-2

^
ISBN 978-1-86239-694-4

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[:1-1] 
ISBN 978-0-12-824360-2

[:0-2] 
ISBN 978-1-86239-694-4

[1]

[2]