Perfect ammonite (micro-shell), pearly color given by the fossilization of the shell, with opal reflections.
Fossil of about ± 9.5 cm × ± 7.7 cms. Ammonite measures ± 6 x 5 cm.
"In ammonites, the size of the macro-shell of a given species (supposedly female dimorphic) could be up to 10 times larger than its corresponding micro-shell (supposedly male dimorphic).
Cretaceous, Fox Hills Formation
Meade County, South Dakota (USA)
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