Cretaceous ammonite Placenticeras syrtale Morton found in Barbour County. Ammonites first appeared in the seas 400 million years ago and died out during the Cretaceous-Paleogene mass extinction about 66 million years ago. This specimen dates to the Campanian age, approximately 72 to 83 million years ago.
Cretaceous Ammonite
![](https://bunny-wp-pullzone-5vqgtgkbhi.b-cdn.net/wp-content/uploads/2023/04/Ammonite-1-922x1300.jpg)
Courtesy of the University of Alabama Museums/Alabama Museum of Natural History
![](https://bunny-wp-pullzone-5vqgtgkbhi.b-cdn.net/wp-content/uploads/2023/04/Ammonite-1-922x1300.jpg)