Ammonite (microconcha) perfect, pearly color given by the fossilization of the shell, about ± 5.3 cm × 4.4 cm. Behind it has another species (Sphenodiscus) without cleaning. The piece measures ± 13 cms × ± 9 cms.
"In the ammonites, the size of the macrochate of a given species (supposedly female dimorph) could be up to 10 times larger than its corresponding microconcha (supposedly male dimorph).
Upper Cretaceous, Fox Hills Formation
South Dakota (USA)
There are yet no reviews for this product.
Please log in to write a review. Log in