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Echioceras

Echioceras is an extinct genus of ammonites from the Early Jurassic of Europe and North America.

Description
Shell of Echioceras species can reach a diameter of about .. The narrow and broad evolute shell is reinforced by fine ribs on inner whorls, progressively becoming stronger, straight and distinct. ==Distribution==
Distribution
Fossils of species within this genus have been found in the Jurassic rocks of Canada, Hong Kong, Turkey and United Kingdom, and Alps. ==References==
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