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| The Upper Givetian (Middle Devonian) Subterminus Conodont Zone in North America, Europe and North Africa Narkiewicz, K.; Bultynck, P. (2010). The Upper Givetian (Middle Devonian) Subterminus Conodont Zone in North America, Europe and North Africa. J. Paleontol. 84(4): 588-625. https://dx.doi.org/10.1666/10-029.1
In: Journal of Paleontology. The Paleontological Society: Tulsa, Okla.. ISSN 0022-3360; e-ISSN 1937-2337, meer
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The base of the subterminus Zone corresponds to a level within the uppermost part of the hermanni Zone; the top is characterized by the occurrence of the earliest Ancyrodella taxa, Montagne Noire Zones MN 1 and the base of MN 2 or slightly above the base of the falsiovalis Zone. The diagnosis of Icriodus subterminus is amended and two morphotypes are recognized. The stratigraphic range of the alpha morphotype is confined to an interval between the uppermost part of the hermanni Zone and the top of the MN 3 Zone; the beta morphotype may range into the MN 6 Zone. The holotype of Icriodus subterminus from the North Liberty beds in Iowa is most likely a specimen that was reworked from the Cedar Valley Limestone. Icriodus cedarensis and Icriodus tafilaltensis are described as new species, and the diagnoses of Icriodus excavatus and Icriodus expansus are amended. Between the Icriodus difficilis and Icriodus symmetricus zones, an Icriodus expansus Zone is defined. |
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