Laboratory;
of;
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Environmental;
Geology,;
China;
University;
of;
Geosciences,;
Wuhan;
430074,;
China;
State;
Key;
Laboratory;
of;
Geological;
Process;
and;
Mineral;
Resources,;
China;
University;
of;
Geosciences,;
Wuhan;
430074,;
China;
State;
Key;
Laboratory;
of;
Geological;
Process;
and;
Mineral;
Resources,;
China;
University;
of;
Geosciences,;
Wuhan;
430074,;
China;
Laboratory;
of;
Biological;
and;
Environmental;
Geology,;
China;
University;
of;
Geosciences,;
Wuhan;
430074,;
China;
Geological;
Survey;
of;
Guizhou;
Province,;
Guiyang;
550011,;
China;
Laboratory;
of;
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and;
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Geology,;
China;
University;
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Wuhan;
430074,;
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Permian-Triassic; Boundary,; terrestrial; sequence,; U-Pb; age,; Chahe; section,; accuracy;