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The ammonites faunas from the lower and middle carixian of les cottards cher france

The ammonites faunas from the lower and middle carixian of les cottards cher france

Geobios (Villeurbanne) 11(3): 345-366

The study of the traditional Cottard layer allows the succession of lower and middle Carixian ammonites to be established. The evolution of the Tropidoceras-Acanthopleuroceras lineage, a regular modification of the ribbing density and L1 structure, and an iterative variation of section and tuberculization are discussed. The identifying features of Polymorphites and Beaniceras are given and 3 new spp. are described: P. evolutus, cottardiense and A. alisiense.

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Accession: 006599554

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DOI: 10.1016/S0016-6995(78)80035-7

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