Kingdom Animalia Subphylum Crinozoa Order Uintacrinida | Phylum Echinodermata Class Crinoidea Genus Marsupites | |
Marsupites is an extinct genus of crinoids from the Cretaceous.
Biostratigraphic significance
The International Commission on Stratigraphy (ICS) has assigned the extinction of Marsupites testudinarius as the defining biological marker for the start of the Campanian Stage of the Cretaceous, 83.6 ± 0.2 million years ago.
References
Marsupites Wikipedia(Text) CC BY-SA