Unique and special collectible fossils
Unique and special collectible minerals
Unique and special collectible fossils
Unique and special collectible minerals
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Ammonite (microshell) perfect, pearly color given by the fossilization of the shell. The ammonite measures ± 4 cm in diameter. Mounted on a 4 x 4 cm base.
"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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