Perfect ammonite (micro-shell), pearly color given by the fossilization of the shell. The ammonite measures ± 3 in diameter and the total piece ± 7.5 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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