Why all the Ammonoid Fossils

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Architeuthis
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The latest for this old thread

Stephen, D.A., Bylund, K.G., Bybee, P.J. and Ream, W.J.: Ammonoid beds in the Lower Triassic Thaynes Formation of western Utah, USA, in: Cephalopods: Present and Past, 2010, Edited by: Kazushige Tanabe, Yasunari Shigeta, Takenori Sasaki & Hiromichi Hirano.

Ongoing research may refine the results in the future. :smile:
 

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