Norian

System/
Period
Series/
Epoch
Stage/
Age
Age (Ma)
JurassicLower/
Early
Hettangianyounger
TriassicUpper/
Late
Rhaetian201.3~208.5
Norian~208.5~227
Carnian~227~237
MiddleLadinian~237~242
Anisian~242247.2
Lower/
Early
Olenekian247.2251.2
Induan251.2251.902
PermianLopingianChanghsingianolder
Subdivision of the Triassic system
according to the ICS, as of 2018.[1]

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 ~227 to 208.5 million years ago.[2] It was preceded by the Carnian and succeeded by the Rhaetian.[3]

Stratigraphic definitions

Cast of a tridactyl footprint of a theropod dinosaur from the Norian of the Czech Republic.

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
Other Languages
Afrikaans: Norium
asturianu: Norianu
català: Norià
Deutsch: Norium
español: Noriense
français: Norien
Nederlands: Norien
norsk nynorsk: Norium
polski: Noryk
português: Noriano
srpskohrvatski / српскохрватски: Norik (geologija)
українська: Норійський ярус