The section of Placenticeras costatum from the upper Cretaceous, Bearpaw formation (75-72 million years ago), showing strong iridescences of red, orange, green, blue.
91⁄2 x 83⁄4 x 3in. (24.1 x 22.3 x 7.6cm.)
Please note this lot is the property of a private individual.
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