73.5 Million Years Old
Plaenticeras meeki is an ammonite species from the Late Cretaceous. These cephalopods were fast-moving nektonic carnivores. They mainly lived in the American Interior Basin (Western Interior Seaway).
Ammonite is in two parts nested inside itself. The center of which comes away from the stand made of its own larger exterior of the same ammonite.
The ammonite as a whole measures approximately 12 inches tall and 12 inches wide with approximately 4 inches of depth.
The ammonite center that can be removed measures approximately 9.25 inches at its widest, and the stand the ammonite nestles into measures approximately 12 inches.