Ammonite (microconcha) perfect, pearly color given by the fossilization of the shell. It measures ± 6.5 in diameter.
"In the ammonites, the macro-shell size of a given species (supposedly female dimorph) could be up to 10 times larger than its corresponding micro-shell (supposedly male dimorph).
Cretaceous -Fox Hills Formation
South Dakota (USA)
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