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#KT loss of carbon isotope depth gradient > drastic drop in marine productivity: Zachos et al 1989 #KTImpactRecap http://t.co/xCydGMTkNI
#KT loss of carbon isotope depth gradient > drastic drop in marine productivity: Zachos et al 1989 #KTImpactRecap http://t.co/xCydGMTkNI