Iridescent-Pearly Eutrephoceras with Marine Shell Fossil- Pierre Shale Montana | River Walkers Minerals Display making these teeth especially interesting

making these teeth especially interesting to collectors

soft yellow coloring

UV-reactive calcite

and mineral association

Iridescent-Pearly Eutrephoceras with Marine Shell Fossil- Pierre Shale Montana | River Walkers Minerals Display making these teeth especially interestingLocale: Pierre Shale Formation, Glendive, Montana, USA Age: Late Cretaceous (~7080 million years old) Dimensions: 371g 3. 7 x 2. 7 x 2 inches This attractive fossil association from the Pierre Shale of eastern Montana features a beautifully preserved Eutrephoceras dekayi accompanied by an associated marine shell fossil preserved in natural matrix. Both fossils display subtle iridescence with flashes of blue, green, pink, and gold that become