Ladinian | |||||||||||||||||||||||
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241.464 ± 0.28 – ~237Ma | |||||||||||||||||||||||
![]() Monte San Giorgio exhibits exceptionally preserved Ladinian vertebrate fossils | |||||||||||||||||||||||
Chronology | |||||||||||||||||||||||
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Etymology | |||||||||||||||||||||||
Name formality | Formal | ||||||||||||||||||||||
Usage information | |||||||||||||||||||||||
Celestial body | Earth | ||||||||||||||||||||||
Regional usage | Global (ICS) | ||||||||||||||||||||||
Time scale(s) used | ICS Time Scale | ||||||||||||||||||||||
Definition | |||||||||||||||||||||||
Chronological unit | Age | ||||||||||||||||||||||
Stratigraphic unit | Stage | ||||||||||||||||||||||
Time span formality | Formal | ||||||||||||||||||||||
Lower boundary definition | FAD of theAmmoniteEoprotrachyceras curionii | ||||||||||||||||||||||
Lower boundary GSSP | Bagolino,Lombardian pre-Alps,Italy 45°49′09″N10°28′16″E / 45.8193°N 10.4710°E /45.8193; 10.4710 | ||||||||||||||||||||||
Lower GSSP ratified | 2005[6] | ||||||||||||||||||||||
Upper boundary definition | FAD of the AmmoniteDaxatina canadensis | ||||||||||||||||||||||
Upper boundary GSSP | Prati di Stuores,Dolomites, Italy 46°31′37″N11°55′49″E / 46.5269°N 11.9303°E /46.5269; 11.9303 | ||||||||||||||||||||||
Upper GSSP ratified | 2008[7] |
TheLadinian is astage andage in theMiddle Triassicseries orepoch. It spans the time between 241.464Ma and ~237 Ma (million years ago).[8] The Ladinian was preceded by theAnisian and succeeded by theCarnian (part of theUpper or Late Triassic).[9]
The Ladinian is coeval with theFalangian regional stage used inChina.
The Ladinian was established by Austrian geologistAlexander Bittner in 1892. Its name comes from theLadin people that live in theItalianAlps (in theDolomites, then part ofAustria-Hungary).
The base of the Ladinian Stage is defined as the place in the stratigraphic record where theammonite speciesEoprotrachyceras curionii first appears or the first appearance of the conodontBudurovignathus praehungaricus. The global reference profile for the base (theGSSP) is at anoutcrop in theriver bed of theCaffaro river atBagolino, in theprovince of Brescia, northernItaly.[10] The top of the Ladinian (the base of the Carnian) is at the first appearance of ammonite speciesDaxatina canadensis.
The Ladinian is sometimes subdivided into two subages or substages, the Fassanian (early or lower) and the Longobardian (late or upper). The Ladinian contains four ammonite biozones, which are evenly distributed among the two substages:
Media related toLadinian at Wikimedia Commons
45°49′09″N10°28′16″E / 45.8193°N 10.4710°E /45.8193; 10.4710