The term "Campanian" primarily refers to a geological period within the Late Cretaceous, approximately 83 to 72 million years ago. It is characterized by significant geological and biological changes, including the diversification of marine life and the presence of large dinosaurs on land. The name is derived from the Campania region in Italy, where rocks from this period were first studied. In addition to its geological significance, "Campanian" is also used to describe a specific stage in the Cretaceous period. Fossils from this time provide valuable insights into the evolution of various species, including ammonites and marine reptiles. The Campanian stage is crucial for understanding the Earth's history and the development of life during the Late Cretaceous.