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Acanthopleuroceras

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1000664Zoom http://www.museum-lehavre.fr/sites/default/files/styles/exposition_portrait/public/multimedia/2011.12.2656_a.jpg?itok=EbTAD1x3Le Havre Museum of Natural History - Photo Christophe Livonnen

Acanthopleuroceras

 

  • Collector/Donor : Le Havre Museum of Natural History

  • Period :  Pliensbachian (190 million years BCE)

  • Origin : Fresney-le-Puceux, Calvados

  • Dimensions : length : 44 cm ; width : 35 cm

 

The La Roche Blain quarries, near Fresney-le-Puceux, are amongst the last quarries still in operation in the area. In palaeontological terms, the La Roche Blain quarries are renowned for the remarkable specimens of calcified ammonites contained in the geological layers. This monumental block of stone – cut in two to open like a book – contains several ammonites and bivalves.

The two specimens of ammoinoids contained in this block are Acanthopleuroceras (from Greek -acanth, meaning « thorn », -pleur, meaning « edge », and -ceras, meaning « horn ») and the  Tragophylloceras (from Greek -trag, meaning « goat », -phyll, meaning « leaf », and -ceras, meaning « horn »). Their presence enables us to certify that this block dates back to Lower Pliensbachian.

The high quality of preservation of the shells provides us with many details which are usually missing.

According to a study by Dommergues et al., published in 2008, the variety of species found in La Roche Blain (about fifty different ammonite species) is due to a specific ecosystem. The existence of various ecological niches resulted in the development of a wide selection of species.

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