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Article: Pathologically deformed Graphoceras (Ammonitina) from the Jurassic of Skye, Scotland

Publication: Palaeontology
Volume: 26
Part: 2
Publication Date: May 1983
Page(s): 443 453
Author(s): Nicol Morton
Addition Information

How to Cite

MORTON, N. 1983. Pathologically deformed Graphoceras (Ammonitina) from the Jurassic of Skye, Scotland. Palaeontology26, 2, 443–453.

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The Palaeontological Association (Free Access)


Successive populations of Graphoceras from the concavum Zone (Aalenian, Middle Jurassic) at Bearreraig (Isle of Skye, N.W. Scotland) contain an unusually high proportion (8-1%) of pathologically deformed specimens, in which the whorls grew over to one side after initial normal growth. Size-frequency distributions and proportions of dimorphs are similar among deformed and normal ammonites, and are consistent with random affliction of members of the populations. The most likely cause of the deformity is disease or parasitic infestation.
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