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GSSP for Carnian Stage


Definition:

The base of the Carnian Stage is located at the base of bed SW4, about 45 cm above the base of the San Cassiano Formation in the Prati di Stuores/Stuores Wiesen section, at about 4.7 km south of San Cassiano, northern Italy. The GSSP is defined in a dark marly limestone, immediately underlying a sandstone bed. The base of the Lutetian Stage coincides with the first occurrence of ammonoid Daxatina canadensis.


Location:

The GSSP is located in the Dolomites, 4.7 km south of San Cassiano, northern Italy at a latitude of 46°31ʼ37ʼʼN and a longitude of 11°55ʼ49”E. The section is located on the left side of the Cordevole Valley, on the southern slope of the crest separating the Badia/Abtei and the Cordevole Valleys.
GSSP for Carnian Stage


Sedimentology:

The Prati di Stuores/Stuores Wiesen section is characterized by a 180 m thick interval of hemipelagic beds of the Wengen and Cassiano Formations. The GSSP lies at the base of Bed SW4, 45 m above the base of the Cassiano Formation. Bed SW4 consists of marly limestone, directly underlying a sandstone bed.


Primary Markers:

The first occurrence of ammonoid Daxatina canadensis.

Secondary Markers:

Conodonts:
The first occurrence of "Paragondolella" polygnathiformis noah is practically coincident with the FAD of Daxatina canadensis, and therefore allows global correlations.

Correlation Events:

FAD ammonoid Daxatina canadensis, near conodont FAD "Paragondolella" polygnathiformis noah. Just above magnetic polarity zone S2n and above the maximum flooding surface of Sequence Lad 3 of Hardenbol et al (1998).

Other Locations around the World:

The genus Daxatina is recognized in other sections of the Southern Alps, British Columbia, Svalbard Archipelago, Alaska, Himalayas region and Nevada.

Notes on Derivation of Age:

Magnetostratigraphic correlation to cycle-scaled Newark magnetic polarity pattern. However, revised correlations suggest 236.8 Ma

References:

Mietto, P., Andreetta, R., Broglio Loriga, C., Buratti, N., Cirilli, S., De Zanche, V., Furin, S., Gianolla, P., Manfrin, S., Muttoni, G., Neri, C., Nicora, A., Posenato, R., Preto, N., Rigo, M., Roghi, G., Sptl, C., 2007. A candidate of the Global Boundary Stratotype Section and Point for the base of the Carnian Stage (Upper Triassic): GSSP at the base of the canadensis Subzone (FAD of Daxatina) in the Prati di Stuores/ Stuores Wiesen section (Southern Alps, NE Italy). Albertiana 36, 78-97.


Mietto, P., Manfrin, S., Preto, N., Rigo, M., Roghi, G., Furin, S., Gianolla, P., Posenato, R., Muttoni, G., Nicora, A., Buratti, N., Cirilli, S., Spötl, C., Ramezani, J., and Bowring, S.A., 2012. The Global Boundary Stratotype Section and Point (GSSP) of the Carnian Stage (Late Triassic) at Prati di Stuores/ Stuores Wiesen Section (Southern Alps, NE Italy). Episodes, 35/3, 414 – 430.



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