Alaunian
| Alaunian | |
|---|---|
| Etymology | |
| Synonym(s) | Middle Norian |
| Usage information | |
| Celestial body | Earth |
| Regional usage | Regional |
| Time scale(s) used | European |
| Definition | |
| Chronological unit | Sub-age |
| Stratigraphic unit | Sub-stage |
The Alaunian, also known as "Middle Norian", is a sub-age in the Upper Triassic. It is followed by the Upper Norian, also known as .
Stage definition[]
It begins with the first appearance of the ammonites rutherfordi and bicrenatus and with the conodont Cypridodella multidentata. The stage ends with the first appearance of the ammonites cordilleranus and quinquepunctatus and the conodont Cypridodella bidentata.
Fossils[]
The holotype MPUM 6009 of the Bergamodactylus pterosaur was found in a layer of the Zorzino Limestone Formation dating from the early Norian (upper Alaunian).
See also[]
References[]
- Additions to the uppermost Alaunian through Rhaetian (Triassic) conchostracan zonation of North America: New Mexico Museum of Natural History and Science HW Kozur, RE Weems - Bulletin, 2011
External links[]
- The Norian Age at palaeos.com (retrieved 16 July 2016)
Categories:
- Triassic geochronology
- Triassic stubs