The Laurentian Ordovician chitinozoan zonation: some modifications and some remaining problems

• Aïcha Achab ^[1] ; Esther Asselin ^[2] ; Azzedine Soufiane ^[1]
  1. [1] Institut National de la Recherche Scientifique

     Institut National de la Recherche Scientifique

     Canadá

     
  2. [2] Centre géoscientifique de Québec, National Resources Canada, Geological Survey of Canada, GSC–Québec
• Localización: Serie correlación geológica, ISSN-e 1666-9479, ISSN 1514-4186, Vol. 17, Nº. 1, 2003
• Idioma: inglés
• Enlaces
  • Texto completo (htm)
• Resumen

  • Several studies dealing with Laurentian chitinozoans have been undertaken since Achab (1989) proposed an Ordovician chitinozoan zonation for Quebec and western Newfoundland. These studies have tested and validated the proposed biozones, refined the existing correlation schemes and led to the identification of some remaining problems. During this time the stratigraphic scale of the Ordovician System has evolved as the result of improved definitions of its global stages and series boundaries. These developments have resulted in the revision of the left colum of the chitnozoan zonation. This paper will present some of these modifications.