The Red River problem revisited: stratigraphic relationships in the Upper Ordovician of central and western United States

• Stig M. Bergström ^[1]
  1. [1] Ohio State University

     Ohio State University

     City of Columbus, Estados Unidos

     
• Localización: Serie correlación geológica, ISSN-e 1666-9479, ISSN 1514-4186, Vol. 17, Nº. 1, 2003
• Idioma: inglés
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• Resumen

  • One of the most controversial, and much discussed, problems in the North American Ordovician geology is the age of a prominent carbonate unit that forms the topmost part of the system in many regions. It can be traced from the Canadian Arctic to Texas, and from the eastern Midcontinent to the Great Basin and contains a distinctive shelly fossil assemblage long known as the Red River (Arctic) fauna. From the 1920s to the present, the rocks having this fauna have been regarded as late Middle Ordovician (late Mohawkian), or late Late Ordovician (Richmondian), or representing a large stratigraphic interval in the Late Ordovician (Cincinnatian). The present paper evaluates biostratigraphic data pertaining to this carbonate unit in an effort to establish its age locally and regionally.