When did ammonites become extinct?

Ammonites became extinct at the end of the Cretaceous Period, approximately 66 million years ago. This extinction event coincided with the extinction of the dinosaurs and several other groups of organisms, and is commonly attributed to a combination of factors, primarily the impact of a massive asteroid and subsequent climate change. Consequently, ammonites are often regarded as one of the most iconic marine fossils representing a bygone era.