Ladinian

Coordinates: 45°49′09″N 10°28′16″E / 45.8193°N 10.4710°E / 45.8193; 10.4710
Source: Wikipedia, the free encyclopedia.
Ladinian
~242 – ~237 Ma
↓
Ammonite Eoprotrachyceras curionii
Lower boundary GSSPBagolino, Lombardian pre-Alps, Italy
45°49′09″N 10°28′16″E / 45.8193°N 10.4710°E / 45.8193; 10.4710
Lower GSSP ratified2005[6]
Upper boundary definitionFAD of the Ammonite Daxatina canadensis
Upper boundary GSSPPrati di Stuores, Dolomites, Italy
46°31′37″N 11°55′49″E / 46.5269°N 11.9303°E / 46.5269; 11.9303
Upper GSSP ratified2008[7]

The Ladinian is a

Ma and ~237 Ma (million years ago).[8] The Ladinian was preceded by the Anisian and succeeded by the Carnian (part of the Upper or Late Triassic).[9]

The Ladinian is coeval with the Falangian regional stage used in China.

Stratigraphic definitions

The GSSP of the Ladinian at Bagolino in Italy

The Ladinian was established by Austrian geologist Alexander Bittner in 1892. Its name comes from the Ladin people that live in the Italian Alps (in the Dolomites, then part of Austria-Hungary).

The base of the Ladinian Stage is defined as the place in the stratigraphic record where the

river bed of the Caffaro river at Bagolino, in the province of Brescia, northern Italy.[10] The top of the Ladinian (the base of the Carnian) is at the first appearance of ammonite species Daxatina 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:

Ladinian life

Main page: Category:Ladinian life

Notable formations

* Tentatively assigned to the Ladinian; age estimated primarily via terrestrial tetrapod biostratigraphy (see Triassic land vertebrate faunachrons)

References

Notes

  1. doi:10.3389/feart.2020.00196
    .
  2. PMID 17919771
    .
  3. ^ Retallack, G. J.;
    doi:10.1130/0016-7606(1996)108<0195:GCGBPT>2.3.CO;2
    . Retrieved 2007-09-29.
  4. S2CID 35498132
    .
  5. ISBN 978-0-444-63771-0
    .
  6. doi:10.18814/epiiugs/2005/v28i4/001
    . Retrieved 23 December 2020.
  7. doi:10.18814/epiiugs/2012/v35i3/003
    . Retrieved 13 December 2020.
  8. ^ "Chart". International Commission on Stratigraphy. Retrieved 20 February 2022.
  9. geologic timescale
    see Gradstein et al. (2004)
  10. ^ The GSSP was established by Brack et al. (2005)

Literature

  • Brack, P.; Rieber, H.; Nicora, A. & Mundil, R.; 2005: The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale, Episodes 28(4), pp. 233–244.
  • Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.

External links

45°49′09″N 10°28′16″E / 45.8193°N 10.4710°E / 45.8193; 10.4710

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