This spectacular Agaricocrinus americanus crinoid was recovered in Crawfordsville, Indiana. It is an exceptionally preserved specimen with considerable length, an articulated stem and attractive color that contrasts perfectly against the
Sphenodiscus lenticularis, Fox Hills Formation, South Dakota Late Cretaceous (~ 70 mya) Both sides of this handsome specimen display the extraordinarily intricate suture patterns that are characteristic of this species.
Ammonites are an extinct group of marine invertebrate animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids than they are to shelled nautiloids such as the living Nautilus species.