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白垩纪
chalk cretaceou eriod cretaceous period
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白垩纪的
cretaceous
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白垩纪海进
cretaceous transgression cretaceoustra gre ion
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白垩纪海路
western interior seaway
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白垩纪末期
laramide revolution
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白垩纪石油
cretaceous oils
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白垩纪时期
cretaceous period million years ago
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白垩纪研究
cretaceous research
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上白垩纪
chalk cretaceous
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晚白垩纪
santonian
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下白垩纪
cretaceous
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早白垩纪
gault series
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第三纪
[地质学] (新生代第一个纪) tertiary; the tertiary period
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白垩纪的化石
cretaceous fossils
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