1 9 6 5 ▁by ▁Hil ary ▁and ▁Jan ette ▁De acon . ▁There ▁are ▁very ▁little ▁in ▁situ ▁depos its ▁left . ▁ ▁All ▁the ▁artifact s ▁at ▁the ▁How ies on ' s ▁Po ort ▁site ▁were ▁found ▁below ▁a ▁bar ren ▁layer ▁about ▁a ▁foot ▁thick ▁in ▁a ▁black ▁layer ▁also ▁about ▁a ▁foot ▁thick . ▁The ▁stone ▁tools ▁were ▁mostly ▁large ▁segments ▁or ▁' c res c ents ', ▁ob liqu ely ▁back ed ▁bl ades ▁and ▁un ifa cial ▁and ▁b ifa cial ▁points . ▁▁ ▁There ▁are ▁no ▁rock ▁paint ings , ▁nor ▁b one ▁or ▁shell ▁artifact s , ▁though ▁b one ▁and ▁shell ▁artifact s ▁▁ ▁are ▁found ▁in ▁the ▁depos its ▁elsewhere ▁of ▁the ▁How ies ons ▁Po ort ▁period . ▁ ▁Stone ▁tools ▁similar ▁to ▁those ▁in ▁the ▁cave ▁have ▁been ▁collected ▁from ▁hills ides ▁above ▁the ▁rock ▁shelter . ▁ ▁Origin ally , ▁and ▁until ▁the ▁mid - 1 9 7 0 s , ▁the ▁remains ▁at ▁How ies ons ▁Po ort ▁Sh elter ▁were ▁thought ▁to ▁belong ▁to ▁the ▁ ▁Mag os ian ▁period ▁and ▁so ▁intermediate ▁in ▁time ▁and ▁technology ▁between ▁the ▁Middle ▁Stone ▁Age ▁and ▁Late ▁Stone ▁Age . ▁However , ▁opt ically ▁stim ulated ▁lum ines c ence ▁d ating ▁pushed ▁back ▁dates ▁for ▁occupation ▁by ▁this ▁period ▁to ▁ 6 5 , 8 0 0 ▁B P ▁and ▁ 5 9 , 5 0 0 ▁B P . ▁ ▁A part ▁from ▁the ▁How ies ons ▁Po