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Subcommission on Triassic Stratigraphy

Welcome to the website of the Subcommission on Triassic Stratigraphy (STS). Under the auspicities of the International Union of Geological Sciences (IUGS) and International Commission on Stratigraphy (ICS), the STS is charged with the establishment of a standard, globally applicable stratigraphic scale for the Triassic system.


Executive (2016-2020)


Chair: Mark Houslow, Lancaster, UK

Vice Chair: Wolfram K├╝rschner, Oslo, Norway

Secretary General: Christopher A. McRoberts, Cortland, New York, USA

Past Chair :Marco Balini, Milano, Italy

Recent News


Global Triassic 2.

Recently published by the New Mexico Museum of Natural History & Science, Bulletin 61: The Triassic System: New Developments in Stratigraphy and Paleontology Edited by: Lawrence H. Tanner, Justin A. Spielmann and Spencer G. Lucas. This volume containing 49 individual papers spread over more than 600 pages iis now available online with free access to downloadable pdf papers of individual contributions. Click here to
access the volume.


Norman J. Silberling (1928-2011)

On September 27, 2011, Norm Silberling peacefuly passed away in Colorado USA. Norm was a principle contributer, along with Tim Tozer, on the development of the North American time scale for the Triassci and made significant advances to our undersanding of the complex history of the accreted terranes of the American Cordillera. A gentle man who selflessly shared his vast knowledge, he was always willing to provide assistance and sound advice


Albertiana moved to new server.

The official publication of the STS, Albertiana, is now avaialble on SUNY Cortland's webserver. The newly designed web presence should provide Triassic researchers a more stable and user friendy experience. Current issues and archived volumes can be downloaded in pdf format. Click here to visit the new Albertiana page.


Timothy Edward Tozer (1928-2010)

On December 26, 2010, Tim Tozer passed away in Vancouver, B.C. Canada. He was a major figure in the Triassic world for many decades and contributed greatly to our science. In honour of his contributions, Michael Orchard held a special session on the Triassic at the 20th Canadian Paleontology Conference at the University of British Columbia, Vancouver, Canada. 19-22 August 2011.


The Base of Carnian successfully ratified by IUGS.

The proposal by Mietto et al. (see Albertiana, v. 36, 2007) for the Global Boundary Stratotype Section and Point (GSSP) defining the base of the Carnian Stage of the Triassic has passed both the base-Carnian Task Group and STS voting membership by unanimous vote. The measure has passed the ICS by majority vote and has been ratified by the IUGS


The Base of Ladinian successfully ratified by IUGS.

The proposal by Brack et al. for the Global Boundary Stratotype Section and Point (GSSP) defining the base of the Ladinian Stage of the Middle Triassic to be the base of Eoprotrachyceras curionii at the Bagolino section of Italy has passed the ICS by majority vote and has been ratified by the IUGS at its recent meeting in Lithuania. Click here for a the full proposal (1.6 MB pdf file).

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Voting and Corresponding Members

Click here for a list of current STS membership.

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The STS publishes a semiannual Newsletter, Albertiana. Edited by Christopher McRoberts (SUNY Cortland), Albertiana has its own website which can be found by clicking here.

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Stage Boundary Task Groups

Task Groups of the STS are organizational bodies created for the selection and definition of the lower boundaries of the stages of the Triassic System. Currently,  there are six active task groups, and two inactive ones that have completed their tasks.

Listing of Task Groups

Base Rhaetian Task Group,
M. Balini chair.
Base Norian Task Group, M. Hounslow, chair
Base Carnian Task Group,
M. Gaetani, chair. Task Group work completed *
Base Ladinian Task Group,
A. Baud, chair. Task Group work completed **
Base Anisian Task Group,
M. Balini, chair.
Base Olenekian Task Group,
Y. D. Zakharov, chair.
Base Induan Task Group,
Yin Hongfu, chair. Task Group work completed ***
Non-marine Boundaries Task Group,
S. Lucas, chair.

*In 2008, the base of Carnian Stage was approved by the STS and ratified by the ICS and IUGS. The boundary is defined at the first appearance of the ammonoid Daxatina canadensis (Whiteaves) which is coincident with the base of the D. canadensis subzone of the Trachyceras zone in the Prati di Stuores/Stuores Wissen section of northern Italy.

**In, 2005, the base of the Ladinian Stage was approved by the STS and ratified by the ICS and IUGS. The boundary is defined at the first appearance of the ammonoid Eoprotrachyceras curionii, in the Bagolino section, Province of Brescia, northern Italy.

***In 2001, the base of the Induan Stage (and therefore the Permian/Triassic boundary) was approved through majority vote by the STS and ratified by ICS (Yin et al., 2001). The boundary is defined at the first appearance of the conodont Hindeodus parvus at the base of Bed 27c of Meishan section D, Changxing County, Zhejiang Province, South China.

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July 19-23, 2015. STRATI 2005. 2nd International Congress on Stratigraphy (Graz, Austria). The congress follows the invitation by the International Commission on Stratigraphy (ICS) of the International Union of Geological Sciences (IUGS) to be held in Graz (Austria), July 19-23, 2015. The congress will be open to all topics in stratigraphy. The technical program will range from the Archean to the Holocene, across all techniques and applications of stratigraphy and the discoveries that the stratigraphic record reveals about the Earth system. In addition, it will also serve as the primary venue for ICS business, for ICS subcommissions to meet and awarding the ICS stratigraphy prizes. For more information, visit the conference website here or downlowad the 1st circula here.

August 27 - September 1, 2015. 2nd Boreal Triassic Conference & 12th International Workshop on the Permo-Triassic (Svalbard). The conference is initiated by the International Triassic Workshop Group but is also open for all geologists. Extensive work on the late Permian and Triassic succession of Svalbard has taken place the last years. We thus expand our conference to present these results of interest to the scientific community and to the ongoing exploration companies now active in the Barents Sea. Just finished thesis work and ongoing work will also be presented, also in poster sessions. For more information, visit the conference website here or downlowad the 1st circular here.




February 12-16, 2014. Pan-European Correlation of the Triassic: 11th International Field Workshop - NW Gondwana margin of the Neo-Tethys (Negev, southern Israel). This workshop offers participants the opportunity to Triassic succession in southern Israel (Negev, Makhtesh Ramon, Makhtesh Areif). The Triassic succession is outcropped in the region which is considered to be a future UNESCO Geo-park, named “Makhteshim Country”. This is not only because of the abundantly interesting geological sites, but also due to its archaeological and ecological value.

September 23-27, 2013. Pan-European Correlation of the Triassic: 10th International Field Workshop - Permian and Triassic of the eastern Iberian Ranges, Spain. This workshop offers participants the opportunity to study, Triassic and Jurassic sequences every day in the eastern Iberian Ranges, in Cuenca and Teruel provinces. Stops will include Permian and Triassic (continental and marine) sections as mentioned above. Description of the stops will be detailed in the second circular. Contact José López-Gómez for more information.


August 19-22, 2011. 21st Canadian Paleontology Conference, Vancouver, B.C., Canada. Organized by The Earth and Ocean Sciences Department University of British Columbia and The Geological Survey of Canada. Please note there will be a special session on the Triassic, dedicated to Timothy Edward Tozer (1928-2010). This session is the only scheduled meeting of the STS in 2011. Click here to go to the conference website, here to see the announcement in vo. 39 of Albertiana, or contact Michael Orchard for more information.

September 4-9, 2011. Pan-European Correlation of the Triassic: 8th International Field Workshop - Triassic of Southeast France (Provence: Var and Alpes-maritimes). This workshop offers participants the opportunity to study, through a variety of landscapes (from coastal cliffs of the Toulon area up to mountains about 2,000 m asl of the Dôme de Barrot), various modes of Permian-Triassic unconformable boundary, and a Triassic series that presents both “Germanic” characters by its lithofacies, and “Sephardic” (Tethyan) characters by its palaeontological content. Contact Marc Durand for more information or click here for the first circular and here for registration form.

September 5-8, 2011. 13th Russian Palynological Conference "Modern Palynological Issues" (Syktvkar, Russia). This conference offers thematic sessions involving applied palynology, palynological methods, and several sessions on palynostratigraphy and paleoecology that would be of interest to STS members. Contact Nataly Ilyina for further information information and click here for the first circular and here for second circular (both MS Word documents).

September 19-22, 2011. Sixth International Conference on Environmental Micropaleontology, Microbiology and Meiobenthology. Moscow, Russia (with pre-meeting fiield trips in St. Petersburg and Leningrad). The EMMM-2011 will be in Moscow and St. Petersburg, Russia. The first part will include a field trip to be carried out by the FGUP "A.P. Karpinsky Russian Geological Research Institute" in the St. Petersburg and Leningrad region on September 15–18. The second part will include technical sessions conducted at the A.A. Borissiak Paleontological Institute, Russian Academy of Sciences, on September 19–22. The First Circular of EMMM-2011 contains important information about this meeting. It is also available at www.paleo.ru/EMMM-2011. Please, use this web site for getting news and documents for EMMM-2011. Contact organizing committee member Valery Vuks or click here for the first circular and here for futher information on the EMMM Group.


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Annual Reports of the STS

2009 Annual Report [pdf file]

2008 Annual Report [pdf file]

2006 Annual Report [pdf file]

2005 Annual Report [pdf file]

2004 Annual Report [pdf file]

2003 Annual Report [pdf file]

2002 Annual Report [pdf file]

2001 Annual Report [pdf file]

2000 Annual Report [pdf file]

1999 Annual Report [pdf file]

1998 Annual Report [pdf file]

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Albertiana The official newsletter of the STS

IGCP 467: Triassic Time and Trans-Panthalassan Correlations

IGCP 458: Triassic-Jurassic Boundary Events

International Commission on Stratigraphy (ICS) home page

International Union of Geological Sciences (IUGS) home page

International Geological Correlation Programme home page

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Site maintained by C. McRoberts, State University of New York at Cortland. All rights reserved.
Page created: 30 August, 2004; Updated: 16 February, 2006.