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shale gas(6)
enrichment pattern(2)
geological conditions(2)
huangling uplift(2)
hydraulic fracturing(2)
longmaxi formation(2)
ordovician(2)
silurian(2)
wufeng formation(2)
yichang(2)
aerobic degradation(1)
anoxia(1)
anthropogenic seismicity(1)
astronomical time scale(1)
biomarkers(1)
black shales(1)
boulder creek [wisconsin](1)
bromide(1)
bächental(1)
calhoun county [florida](1)
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