Cosmoceras proniae ammonite from the Jurassic of Russia (165 Million years ago) within the shell of modern Abalone (Haliotis sp.) A photo showing the remarkable preservation in the ammonite fossil of the metamorphosed nacreous layer that gives both species, living and extinct, their structural shell colours. See Abelone shell picture in this collection for description of the structural properties that give rise to the iridesence.
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