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Brontosaurus is an invalid name for Apatosaurus excelsus. Apatosaurus excelsus fossils date to between 154 and 151 million years ago. This was during the Kimmeridgian and Tithonian stages of the Jurassic period. The Jurassic period was the second of the three periods in the Mesozoic era.

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∙ 13y ago
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