Norian
Middle Late Triassic age, named for Noricum/Noric Alps; historical Hallstatt fossil assignments changed its extent.
Language and route: International scientific terminology from Latin geographical name. Latin regional name Noricum / Noric Alps → scientific Norian; the ancient referent is geographical, not an era-description.
Literal gloss: of/from Noricum
The name and its history
Edmund von Mojsisovics · 1873 (historical attribution)
- What does the word literally mean?
- ‘of/from Noricum’, referring to the Noric Alps and the Latin geographical name Noricum.
- What did the original author mean?
- Mojsisovics used a Norian name within the evolving Alpine Triassic scheme. Subsequent reassignments of Hallstatt ammonoid faunas changed which rock beds the term encompassed.
- Why was the name needed?
- Fossil-bearing Alpine successions could not be fitted cleanly to the Germanic stratigraphy, and an evolving sequence of marine stages was required.
- What evidence supported the original concept?
- Later ammonoid findings showed that some rocks previously correlated as Norian belonged elsewhere; the historical Norian cannot be treated as having the modern scope from inception.
- How has geology changed the concept?
- The ICS Norian is an internationally defined stage whose base remains a boundary-correlation research issue in the consulted subcommission literature.
Further historical context
The name invokes the Noric Alps and the Latin geographical name Noricum. Mojsisovics used a Norian name within the evolving Alpine Triassic scheme. Subsequent reassignments of Hallstatt ammonoid faunas changed which rock beds the term encompassed.
Fossil-bearing Alpine successions could not be fitted cleanly to the Germanic stratigraphy, and an evolving sequence of marine stages was required. Later ammonoid findings showed that some rocks previously correlated as Norian belonged elsewhere; the historical Norian cannot be treated as having the modern scope from inception.
The ICS Norian is an internationally defined stage whose base remains a boundary-correlation research issue in the consulted subcommission literature.
Editorial qualification
Do not infer that all rocks of the Noric Alps are of Norian age. The precise history of stage limits is more complex than the year of the name’s first use.
Related names
Sources
- ICS International Chronostratigraphic Chart, 2026/06 — Official current ranks and names; ages are subject to revision
- Gómez and colleagues (2009), Geology as a local science, stage-origin tables — Secondary author/date and geographic roots; some attributions inconsistent with specialist histories
- Brack et al., GSSP for the Ladinian Stage, Bagolino (Episodes) — Historical correction: earlier misidentification of Hallstatt ammonoid ages and Bittner’s Ladinian
- Mojsisovics, Waagen and Diener (1895), Entwurf einer Gliederung der pelagischen Sedimente des Trias-Systems, pp. 1271–1302 — Digitised contemporary 1895 joint proposal; contemporaneous basis, not necessarily first use of each name