Crioceras Heteromorph Ammonite from France

Crioceras sp

Ammonita, Eoduroceratidae

Geological Time: Lower Cretaceous, Hauterivian Stage (~135 million years ago)

Size (25.4 mm = 1 inch): Ammonite is 34 mm across on a 45 mm by 14 mm by 25 mm base

Fossil Site: Montagne de Lute Province, France

Code: RS116

Price: $95.00


Heteromorph Ammonite Description: A fine example of an ammonite of the genus Crioceras of the Hauterivian Stage (135 m.y.a) deposits of France. It has what is known as heteromorphic shape. While most ammonites have spiral shells that retain the same shape throughout growth (homomorph), a major group of ammonites, the Ancyloceratina, Heteromorphemerged during the Late Jurassic which had uncoiled shells instead, and were called herteromorph ammonites (different-shaped). While little is known of their mode of life, their uncoiled shells would have precluded fast swimming. They may have wobbled their way through the water column with out-splayed tentacles, sweeping whatever came within their reach into their hungry mouths. As all ammonites, these went extinct at the end of the Cretaceous. This fine example sits on a matrix pedestal which has a flattened base for self-display.

Ammonite Fossil Purchase

click ammonite pictures to enlarge


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