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上白垩纪
desert.
Chalk
;
Upper Cretaceous
(Cr₂)
earth.sc.
Upper Cretaceous
上白垩纪〔系〕
earth.sc.
Upper Cretaceous
上 白垩 纪
:
4 phrases
in 3 subjects
Earth sciences
2
Geology
1
Oil / petroleum
1
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