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cretaceous-paleogene transition(2)
volcanism(2)
background levels(1)
c-isotope stratigraphy(1)
carbon isotope stratigraphy(1)
diffuse sources(1)
heavy metals(1)
hg isotopes(1)
hg stratigraphy(1)
mercury(1)
parnaíba river delta(1)
thermo-desorption(1)