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Cretaceous

adjective
🔊/krɪˈteɪʃəs/
🔊/krɪˈteɪʃəs/
 (geology地质学)
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  1. belonging to the period the between around 146 and 65 million years ago, when dinosaurs lived (until they died out); relating to the rocks formed during this time白垩纪的Topics Historyc2