al ▁in ▁establish ing . ▁He ▁also ▁contributed ▁to ▁the ▁system atic ▁and ▁detailed ▁mapping ▁of ▁Norway ' s ▁bed rock . ▁▁ ▁His ▁principal ▁works ▁were ▁Das ▁Christian ia ▁Sil ur be cken ▁( 1 8 5 5 ) ▁and ▁U ds igt ▁over ▁det ▁syd lige ▁N org es ▁Ge olog i ▁( 1 8 7 9 ). ▁From ▁ 1 8 5 6 ▁to ▁ 1 8 5 7 ▁he ▁was ▁the ▁chairman ▁of ▁the ▁Norwegian ▁Poly techn ic ▁Society . ▁K jer ulf ▁was ▁a ▁member ▁of ▁the ▁Royal ▁Swedish ▁Academy ▁of ▁Sciences ▁from ▁ 1 8 6 9 . ▁ ▁Personal ▁life ▁In ▁ 1 8 5 6 , ▁he ▁married ▁Marie ▁Ag nes ▁Christian e ▁An ker ▁( 1 8 2 6 - 1 9 1 5 ), ▁daughter ▁of ▁Erik ▁The odor ▁Christian ▁Bern hard us ▁An ker ▁( 1 7 8 5 - 1 8 5 8 ) ▁and ▁Bet zy ▁S ne edor ff ▁( 1 7 9 0 - 1 8 7 5 ). ▁She ▁was ▁the ▁sister ▁of ▁B ets y ▁Jul iane ▁Charlotte ▁An ker ▁( 1 8 3 0 - 1 9 1 2 ) ▁who ▁married ▁the ▁noted ▁painter ▁Hans ▁G ude . ▁▁ ▁The odor ▁K jer ulf ▁ ▁published ▁three ▁collections ▁of ▁poetry ; ▁in ▁ 1 8 4 8 , ▁ 1 8 5 4 ▁and ▁ 1 8 6 6 . ▁In ▁ 1 8 5 5 , ▁he ▁was ▁awarded ▁the ▁Crown ▁Prince '