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Article: The coarse wrinkle layer of Palaeozoic ammonoids: new evidence from the Early Carboniferous of Morocco

Publication: Palaeontology
Volume: 57
Part: 4
Publication Date: July 2014
Page(s): 771 781
Author(s): <p>Dieter Korn, Christian Klug and Royal H. Mapes</p>
Addition Information

How to Cite

KORN, D., KLUG, C., MAPES, R. H. 2014, The coarse wrinkle layer of Palaeozoic ammonoids: new evidence from the Early Carboniferous of Morocco. Palaeontology, 57, 4, 771–781. doi: 10.1111/pala.12087

Author Information

  • Dieter Korn - Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, Germany (email:
  • Christian Klug - Paläontologisches Institut und Museum, Zürich, Switzerland (email:
  • Royal H. Mapes - Department of Geological Sciences, Ohio University, Athens, OH, USA (email:

Publication History

  • Issue published online: 14 JUL 2014
  • Article first published online: 11 NOV 2013
  • Manuscript Accepted: 9 OCT 2013
  • Manuscript Received: 29 MAY 2013

Funded By

Swiss National Science Foundation. Grant Number: 200021-113956/1, 200020-25029 200020-132870

Online Version Hosted By

Wiley Online Library
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The wrinkle layer is a dorsal shell structure occurring in a number of ammonoids, but its function is still debated. Here, we describe, from Moroccan material of the Early Carboniferous species Maxigoniatites saourensis (Pareyn, 1961), the most conspicuous wrinkle layer known within the Ammonoidea. This additional shell layer occurs in the ventrolateral portion of the adult body chamber and forms continuous lamellae, which range about two millimetres into the lumen of the body chamber. Possible functions are discussed and the most likely interpretation for the structure is ‘fabricational noise’, which is related to the coarsening of the shell ornament of the terminal body chamber.

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