Why is Norian so important nowadays? Norian has captured the attention of millions of people around the world, generating controversy and debate in all areas. Since its appearance, Norian has been the subject of analysis and discussion in various fields, from science and technology to politics and popular culture. In this article we will explore the impact that Norian has had on today's society and how its presence has shaped the way we think and act. Additionally, we will examine the relevance of Norian in a constantly changing world and how its influence continues to be noticeable in our daily lives.
Norian | |||||||||||||||||||||||
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Chronology | |||||||||||||||||||||||
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Etymology | |||||||||||||||||||||||
Name formality | Formal | ||||||||||||||||||||||
Usage information | |||||||||||||||||||||||
Celestial body | Earth | ||||||||||||||||||||||
Regional usage | Global (ICS) | ||||||||||||||||||||||
Time scale(s) used | ICS Time Scale | ||||||||||||||||||||||
Definition | |||||||||||||||||||||||
Chronological unit | Age | ||||||||||||||||||||||
Stratigraphic unit | Stage | ||||||||||||||||||||||
Time span formality | Formal | ||||||||||||||||||||||
Lower boundary definition | Not formally defined | ||||||||||||||||||||||
Lower boundary definition candidates | Base of Stikinoceras kerri ammonoid zone and near FAD of Metapolygnathus echinatus within the M. communisti Conodont zones | ||||||||||||||||||||||
Lower boundary GSSP candidate section(s) | |||||||||||||||||||||||
Upper boundary definition | Not formally defined | ||||||||||||||||||||||
Upper boundary definition candidates |
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Upper boundary GSSP candidate section(s) |
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The Norian is a division of the Triassic Period. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from ~227 to 208.5 million years ago. It was preceded by the Carnian and succeeded by the Rhaetian.
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:
The Norian is divided into three global subages or substages:
Many older studies considered the Rhaetian to be the uppermost substage of the Norian, though it has subsequently been raised to its own stage.
The Revueltian land-vertebrate faunachron corresponds to part of the Norian.
* Tentatively assigned to the Norian; age estimated primarily via terrestrial tetrapod biostratigraphy (see Triassic land vertebrate faunachrons)
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