A broken concretion with fossils inside; Late Cretaceous Pierre shale, near Ekalaka, Montana.

A broken concretion with fossils inside; Late Cretaceous Pierre shale, near Ekalaka, Montana.

Informations
Auteur
Wilson44691
Licence
Public domain
Source
Wikimedia
Voir l'original ↗
Associé à
formation Pierre Shale principale