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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde
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Volume 9, issue 2
Foss. Rec., 9, 198–212, 2006
https://doi.org/10.1002/mmng.200600008
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Foss. Rec., 9, 198–212, 2006
https://doi.org/10.1002/mmng.200600008
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Aug 2006

01 Aug 2006

The ammonoids from the Three Forks Shale (Late Devonian) of Montana

D. Korn1 and A. Titus2 D. Korn and A. Titus
  • 1Museum für Naturkunde der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
  • 2Grand Staircase-Escalante National Monument, 190 East Center Street, Kanab, UT 84741, USA

Abstract. The ammonoid fauna from the Late Devonian Three Forks Shale of Montana is revised. Six taxa were recognised, which belong to the genera Tornoceras, Pernoceras, Raymondiceras, Platyclymenia, Pleuroclymenia, and Carinoclymenia. The ammonoid assemblage suggests a stratigraphic position within the middle Famennian, most probably the Platyclymenia annulata Zone. The ammonoids display extreme septal crowding in intermediate as well as adult growth stages, which can be regarded as evidence for instable palaeoecological conditions during lifetime of the animals.

Die Ammonoideenfauna aus dem oberdevonischen Three Forks Shale von Montana wird revidiert. Sechs Taxa werden unterschieden; sie gehören zu den Gattungen Tornoceras, Pernoceras, Raymondiceras, Platyclymenia, Pleuroclymenia und Carinoclymenia. Die Ammonoideen-Vergesellschaftung spricht für eine stratigraphische Position im mittleren Famennium, wahrscheinlich in der Platyclymenia annulata Zone. Die Ammonoideen zeigen auffällige Drängung der Septen in intermediären und adulten Wachstumsstadien, die als Hinweis auf instabile Lebensbedingungen für die Tiere gewertet werden kann.

doi:10.1002/mmng.200600008

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