Ammonite fossils have been discovered in many parts of the world, primarily in sedimentary rocks that date back to the Mesozoic Era, around 250 to 65 million years ago. These creatures were once widespread in ancient oceans, and their fossils can be found on every continent, including Antarctica.
Some of the richest deposits of ammonite fossils are located in:
- The Cretaceous rocks of North America: Areas such as the Western Interior Seaway, which once split the continent in two, are particularly famous for ammonite finds.
- Europe: Countries like England, France, and Germany have extensive layers of sediment where ammonite fossils are commonly uncovered. The Limestone of the Jurassic period in these areas is especially renowned.
- Asia: The Tethys Sea, which existed during the Mesozoic Era, left behind rich fossil beds in regions of what is now India and the Middle East.
- Australia: Ammonite fossils can also be found in various parts of Australia, particularly in the southern regions that were once underwater.
Fossilized ammonites come in various forms and sizes, showcasing the diversity of the species. The well-preserved and often beautiful shells of ammonites make them popular among collectors and paleontologists alike. Finding these fossils not only helps scientists understand ancient marine ecosystems but also contributes to the study of evolutionary biology.