Catalog
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| Location | United States |
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| Year | |
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| Technique | Milled |
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| Obverse description | The obverse features a detailed relief depiction of a Brontosaurus in a prehistoric landscape setting, shown in profile with its long neck arched. The legend 'BRONTOSAURUS' curves along the upper right rim, with '180 MILLION B.C.' inscribed vertically along the left rim. |
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| Obverse script | Latin |
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| Reverse description | The reverse presents a dinosaur family tree diagram in relief, featuring illustrated depictions of multiple dinosaur species with their names and subgroup labels arranged across the field. The legend 'WHEN THE WORLD WAS YOUNG' curves along the upper left rim, 'DINOSAURS FAMILY TREE' runs along the lower rim, and taxonomic groupings including ORNITHISCHIANS and SAURISCHIANS appear on either side. Individual species depicted include Ceratopsians (Monoclonius), Ornithopods (Corythosaurus), Theropods (Allosaurus), Ankylosaurs (Palaeoscincus), Sauropods (Diplodocus), Stegosaurs (Stegosaurus), and Thecodonts, with time markers at 135 and 180 million B.C. |
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