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Ammolites are fossils that originate from the shells of extinct marine mollusks called ammonites. Ammonites existed from the Devonian period (around 419 million years ago) to the end of the Cretaceous period (about 66 million years ago). This means that the age of ammolites can range from approximately 66 to 419 million years old, depending on the specific species of ammonite they are derived from.

The most prized ammolites, used in jewelry and ornamental objects, are typically from the Late Cretaceous period, making them roughly 66 to 100 million years old. These fossils are particularly associated with the Bearpaw Formation in Alberta, Canada, which is known for its high-quality ammolite deposits.