Harpoceras Ammonite | Germany Amethyst semicircular cephalon (head shield) has

semicircular cephalon (head shield) has a clearly defined glabella that narrows toward the front

during the Precambrian period

Megalodon was the top predator in our oceans from approximately 2-15 million years ago

This process occurs over thousands of years

Crystal is approx 6

Harpoceras Ammonite | Germany Amethyst semicircular cephalon (head shield) hasHarpoceras sp. Early Jurassic (180 MYO) Posidonia Shale Holzmaden, Germany Ammonite approx. size: 9" x 7. 75" Plate approx. size: 11. 75" x 10. 75" This Harpoceras ammonite from the Posidonia Shale in Holzmaden, Germany has been compressed on black slate and is partially pyritized. Ammonoids are a group of extinct marine mollusk animals in the subclass Ammonoidea of the class Cephalopoda. These mollusks, commonly referred to as ammonites, are more