▁ 1 6 ° ▁N ., ▁ 3 0 ° ), ▁the ▁traces ▁of ▁the ▁fault s ▁on ▁the ▁cr ater ▁walls ▁indicate ▁that ▁the ▁fault s ▁have ▁normal ▁disp lac ements . ▁A ▁few ▁fault s ▁cut ▁inter cr ater ▁areas ▁and ▁tr end ▁generally ▁north west ▁or ▁n ortheast ▁( Sc ott ▁and ▁others , ▁ 1 9 7 6 ). ▁ ▁R id ges ▁are ▁bro ader ▁than ▁many ▁lun ar ▁mare ▁rid ges ▁and ▁are ▁conf ined ▁largely ▁to ▁the ▁cr ater ed ▁pla ins ▁materials . ▁Anton i adi ▁D ors um , ▁which ▁is ▁a ▁well - develop ed ▁broad ▁r idge ▁north ▁of ▁the ▁K ui per ▁quad rangle , ▁is ▁less ▁well ▁developed ▁at ▁its ▁south ▁end ▁and ▁appears ▁in ▁this ▁quad rangle ▁as ▁an ▁irregular ▁sc arp . ▁A ▁number ▁of ▁linear ▁de press ions ▁super f icial ly ▁res emble ▁grab ens ▁but ▁are ▁ch ains ▁of ▁over la pping ▁secondary ▁cr aters , ▁for ▁example , ▁Gold stone ▁Vall is ▁( 1 5 ° ▁S ., ▁ 3 2 ° ) ▁and ▁Hay stack ▁Vall is ▁( 5 ° ▁N ., ▁ 4 6 ° ). ▁ ▁Ge olog ic ▁history ▁▁ ▁The ▁interpre table ▁ge olog ic ▁history ▁of ▁the ▁K ui per ▁quad rangle ▁is ▁primarily ▁a ▁record ▁of ▁decre asing ▁meteor oid ▁flux ▁during ▁which ▁large ▁cr aters ▁and ▁bas ins ▁formed ▁and ▁pla ins ▁materials ▁were ▁depos ited . ▁A ▁decre asing ▁rate ▁of ▁cr ater ▁production ▁is