The Khos-Nelege River section of the Ogon’or Formation: a potential candidate for the GSSP of Stage 10, Cambrian System


Authors: Lazarenko NP, Gogin IY, Pegel TV, Abaimova GP

Published in: Bulletin of Geosciences, volume 86, issue 3; pages: 555 - 568; Received 1 January 2011; Accepted in revised form 6 July 2011; Online 19 September 2011

Keywords: Cambrian, Stage 10, trilobite, GSSP, Lotagnostus americanus, Russia,

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The International Subcommission on Cambrian Stratigraphy (ISCS) has recommended a subdivision of the Cambrian System into four series and ten stages. The first appearance datum (FAD) of the cosmopolitan agnostoid trilobite Lotagnostus americanus has been chosen as a good indicator for the base of the uppermost Cambrian stage (Stage 10). The Khos-Nelege section located in the north-eastern Siberian Platform (Western Yakutia, Russia) is proposed as the Global Standard Stratotype Section and Point (GSSP) for the base of the ‘Cambrian Stage 10’. The proposed GSSP coincides with the FAD of L. americanus at 339m above the base of the Ogon’or Formation. The section fulfills the geological and biostratigraphical requirements for a stratotype and the GSSP horizon can be constrained by a number of auxiliary marker taxa. The first appearance of L. americanus is an easily recognizable level in the Cambrian which can be recognized from all major Cambrian continents, including Baltica, Laurentia, Avalonia, South China and Australia.


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