Norian Stage

Norian Stage

      middle of three divisions in the Upper Triassic Series, representing those rocks deposited worldwide during Norian time (216.5 million to 203.6 million years ago) in the Triassic Period. The stage was named after an ancient Roman province south of the Danube River in present-day Austria. The stratotype for the Norian is a formation known as the beds with Cyrtopleurites bicrenatus (ammonoid) (an ammonoid index fossil) at Sommeraukogel, Hallstatt, Austria. The Norian Stage is subdivided into three substages, which in ascending order are the Lacian, Alaunian, and Sevatian. Norian marine strata are correlated worldwide by six ammonoid cephalopod biozones (biozone), all of which have designated type localities in North America. These zones cannot be used for nonmarine strata, however. The Norian Stage underlies the Rhaetian Stage of the Upper Triassic Series and overlies the Carnian Stage of the Upper Triassic Series.

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Norian — System Series Stage Age (Ma) Jurassic Lower Hettangian younger Triassic Upper …   Wikipedia

  • Carnian Stage — ▪ geochronology       lowermost of three divisions of the Upper Triassic Series, representing those rocks deposited worldwide during Carnian time (228 million to 216.5 million years ago) in the Triassic Period. The stage name is probably derived… …   Universalium

  • Rhaetian Stage — ▪ geochronology       uppermost of three divisions in the Upper Triassic Series, representing those rocks deposited worldwide during Rhaetian time (203.6 million to 199.6 million years ago) in the Triassic Period. The stage name is derived from… …   Universalium

  • Oxfordian (stage) — System Series Stage Age (Ma) Cretaceous Lower Berriasian younger Jurassic Upper Tith …   Wikipedia

  • Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium

  • Shonisaurus — Taxobox name = Shonisaurus fossil range = Late Triassic image width = 250px image caption = life restoration of Shonisaurus regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Ichthyosauria familia = Shastasauridae genus = Shonisaurus …   Wikipedia

  • Coelophysis — Holozoa Coelophysis Temporal range: Late Triassic, 216.5–203.6 Ma …   Wikipedia

  • Rhaetian — See Raetians for the Alpine people of antiquity. : See Romansh language for the Rhaetian language. The Rhaetian Stage is the final stage of the Late Triassic Period. It lasted from 203.6 ± 1.5 to 199.6 ± 0.6 million years ago. It was preceded by… …   Wikipedia

  • Chindesaurus — Temporal range: Late Triassic, 216 Ma …   Wikipedia

  • Minicynodon — Temporal range: Late Triassic, Carnian–Norian …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”