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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

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