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 Chinese regional stage.

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:
Many Ladinian and Carnian vertebrates have been discovered in the Paleorrota Geopark in Brazil: Rhynchosaurs, thecodonts, exaeretodonts, Staurikosaurus, Guaibasaurus, Saturnalia tupiniquim, Sacisaurus, Unaysaurus, and many others. Paleorrota lies within the Santa Maria Formation and the Caturrita Formation.
Vertebrates of Ladinian age include:

Coelacanths

†Temnospondyls

†Chroniosuchians

†Tanystropheids

Archosaurs

Suchians

†Thalattosaurs

†Sauropterygians

†Pistosaurs

†Nothosaurs

†Pachypleurosaurs

†Placodonts

†Ichthyopterygians

Therapsids

Literature