Ladinian
The Ladinian is a stage and age in the Middle Triassic series or epoch. It spans the time between Ma and ~237 Ma. The Ladinian was preceded by the Anisian and succeeded by the Carnian.
The Ladinian is coeval with the Falangian regional stage used in China.
Stratigraphic definitions
The Ladinian was established by Austrian geologist Alexander Bittner in 1892. Its name comes from the Ladin people that live in the Italian Alps.The base of the Ladinian Stage is defined as the place in the stratigraphic record where the ammonite species Eoprotrachyceras curionii first appears or the first appearance of the conodont Budurovignathus praehungaricus. The global reference profile for the base is at an outcrop in the river bed of the Caffaro river at Bagolino, in the province of Brescia, northern Italy. The top of the Ladinian is at the first appearance of ammonite species Daxatina canadensis.
The Ladinian is sometimes subdivided into two subages or substages, the Fassanian and the Longobardian. The Ladinian contains four ammonite biozones, which are evenly distributed among the two substages:
- zone of Frechites regoledanus
- zone of Protrachyceras archelaus
- zone of Protrachyceras gredleri
- zone of ''Eoprotrachyceras curionii''
Ladinian life
Notable formations
- Upper Besano Formation
- Erfurt Formation / Lower Keuper
- Jilh Formation
- Meride Limestone
- Upper Muschelkalk
- Perledo-Varenna Formation
- Prosanto Formation
- Zhuganpo Formation / Zhuganpo Member of the Falang Formation
Literature
- ; 2005: The Global boundary Stratotype Section and Point of the Ladinian Stage at Bagolino and its implications for the Triassic time scale, Episodes 28, pp. 233–244.
- ; 2004: A Geologic Time Scale 2004, Cambridge University Press.