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#KT palyno extinction correlated in 17 ND sections, >700,000 specimens: Nichols & @leafdoctor 2002 #KTImpactRecap http://t.co/MTioIE0Gqn
#KT palyno extinction correlated in 17 ND sections, >700,000 specimens: Nichols & @leafdoctor 2002 #KTImpactRecap http://t.co/MTioIE0Gqn