System	Series	Stage	Age (Ma)
Jurassic	Lower	Hettangian	younger
Triassic	Upper	Rhaetian	199.6–203.6
		Norian	203.6–216.5
		Carnian	216.5–228.0
	Middle	Ladinian	228.0–237.0
		Anisian	237.0–245.0
	Lower	Olenekian	245.0–249.7
		Induan	249.7–251.0
Permian	Lopingian	Changhsingian	older
Subdivision of the Triassic system according to the IUGS, as of July 2009.

The Norian is a division of the Triassic geological period. It has the rank of an age (geochronology) or stage (chronostratigraphy). The Norian lasted from 216.5 ± 2.0 to 203.6 ± 1.5 million years ago.^[1] It was preceded by the Carnian and succeeded by the Rhaetian.^[2]

Contents 1 Stratigraphic definitions 2 Palaeontology 2.1 Dinosaurs 2.2 Pterosaurs 2.3 Crocodylomorphs 2.4 Ichthyosaurs 2.5 Dinosauromorphs (non-dinosaurian) 2.6 Placodonts 2.7 Crurotarsans (non-crocodylomorph) 2.8 Mammaliaformes 2.9 Ammonites 3 References 3.1 Notes 3.2 Literature 3.3 External links

[edit] Stratigraphic definitions

The Norian was named after the Noric Alps in Austria. The stage was introduced into scientific literature by Austrian geologist Edmund Mojsisovics von Mojsvar in 1869.

The Norian stage begins at the base of the ammonite biozones of Klamathites macrolobatus and Stikinoceras kerri, and at the base of the conodont biozones of Metapolygnathus communisti and Metapolygnathus primitius. A global reference profile for the base (a GSSP) had in 2009 not yet been appointed.

The top of the Norian (the base of the Rhaetian) is at the first appearance of ammonite species Cochloceras amoenum. The base of the Rheatian is also close to the first appearance of conodont species Misikella spp. and Epigondolella mosheri and the radiolarid species Proparvicingula moniliformis.

In the Tethys domain, the Norian stage contains six ammonite biozones:

• zone of Halorites macer
• zone of Himavatites hogarti
• zone of Cyrtopleurites bicrenatus
• zone of Juvavites magnus
• zone of Malayites paulckei
• zone of Guembelites jandianus

[edit] Palaeontology

• Synapsids
• Aetosaurs
• Dicynodonts
• Phytosaurs

[edit] Dinosaurs

Dinosaurs of the Norian
Taxa	Presence	Location	Description	Images
Agnosphitys				Coelophysis Liliensternus Plateosaurus Sellosaurus Thecodontosaurus
Coelophysis	Late Carnian to early Norian	Ghost Ranch, New Mexico, USA
Halticosaurus
Liliensternus
Plateosaurus
Sellosaurus
Thecodontosaurus	Norian/Rhaetian

[edit] Pterosaurs

Pterosaurs of the Norian
Taxa	Presence	Location	Description	Images
Eudimorphodon				Eudimorphodon Preondactylus
Peteinosaurus
Preondactylus

[edit] Crocodylomorphs

Crocodylomorphs of the Norian
Taxa	Presence	Location	Description	Images
Saltoposuchus				Saltoposuchus

[edit] Ichthyosaurs

Ichthyosaurs of the Norian
Taxa	Presence	Location	Description	Images
Shonisaurus Shonisaurus popularis				Shonisaurus

[edit] Dinosauromorphs (non-dinosaurian)

†Non-dinosaurian dinosauromorphs of the Norian
Taxa	Presence	Location	Description	Images
Dromomeron				Dromomeron
Eucoelophysis		New Mexico

[edit] Placodonts

Placodonts of the Norian
Taxa	Presence	Location	Description	Images
Psephoderma				Psephoderma

[edit] Crurotarsans (non-crocodylomorph)

†Non-crocodylomorph Crurotarsans of the Carnian
Taxa	Presence	Location	Description	Images
Basutodon				Teratosaurus
Teratosaurus

[edit] Mammaliaformes

Mammaliaformes of the Carnian
Taxa	Presence	Location	Description	Images
Eozostrodon
Morganucodon
Sinocodon

[edit] Ammonites

• Acanthinites

[edit] References

[edit] Notes

[edit] Literature

• Brack, P.; Rieber, H.; Nicora, A. & Mundil, R.; 2005: The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale, Episodes 28(4), pp. 233-244.
• Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.

[edit] External links

• GeoWhen Database - Norian
• Upper Triassic timescale, at the website of the subcommission for stratigraphic information of the ICS
• Norges Network of offshore records of geology and stratigraphy: Stratigraphic charts for the Triassic, [1] and [2]

Triassic period
Lower/Early Triassic	Middle Triassic	Upper/Late Triassic
Induan | Olenekian	Anisian | Ladinian	Carnian | Norian Rhaetian