Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm

• Published in: Acta Palaeontologica Polonica
• Main Authors: Hammer, Øyvind, Hryniewicz, Krzysztof, Hurum, Jørn H., Høyberget, Magne, Knutsen, Espen, Nakrem, Hans A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Institute of Paleobiology, Polish Academy of Sciences 2013
• Subjects: Agardhfjellet; Greenland; Norway; Northern Norway; Spitsbergen
• Online Access: https://researchonline.jcu.edu.au/49586/1/49586_Hammer%20et%20al_2013.pdf

We report on the discovery of large cephalopod arm hooks (mega−onychites) from the Kimmeridgian and Volgian of Spitsbergen (Agardhfjellet Formation). This includes a largely uncompressed hook in a seep carbonate, with preservation of surface sculpture. We suggest the use of logarithmic spirals as mo...