Ferdinand Zirkel
Prof Ferdinand Zirkel FRS ( For ) HFRSE ( May 20 , 1838June 11 , 1912 ) was a German geologist and petrographer . 
<triplet> Ferdinand Zirkel <subj> FRS(For) <obj> member of <subj> May 20, 1838 <obj> date of birth <subj> June 11, 1912 <obj> date of death <subj> German <obj> country of citizenship