Iridescent-Pearly Eutrephoceras with Marine Shell Fossil- Pierre Shale Montana | River Walkers Minerals Display sculptural look and comes displayed

sculptural look and comes displayed on the custom metal stand shown

A gorgeous polished-edge amethyst piece covered in deep purple

UV-reactive calcite

A striking 624-gram cabinet piece where calcite serves as the foundation

a vast inland sea that covered much of North America

Iridescent-Pearly Eutrephoceras with Marine Shell Fossil- Pierre Shale Montana | River Walkers Minerals Display sculptural look and comes displayedLocale: 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