▁The ▁building ▁is ▁o val ▁with ▁thick ▁external ▁walls . ▁From ▁these , ▁interior ▁walls ▁project ▁into ▁the ▁main ▁room ▁creating ▁compart ments , ▁one ▁of ▁which ▁houses ▁a ▁hear th . ▁In ▁the ▁centre ▁of ▁the ▁structure ▁is ▁a ▁large ▁re cess ed , ▁stone ▁tank , ▁l ined ▁with ▁flag st ones ▁and ▁rendered ▁water proof ▁by ▁the ▁surrounding ▁cl ay . ▁The ▁capacity ▁of ▁the ▁tank ▁is ▁nearly ▁one ▁thousand ▁lit res ▁and ▁it ▁was ▁found ▁half ▁filled ▁with ▁stones ▁that ▁were ▁sh atter ed ▁and ▁" f ired " ▁by ▁inten se ▁heat . ▁Hed ges ▁originally ▁thought ▁that ▁the ▁building ▁represented ▁a ▁house , ▁but ▁he ▁was ▁trouble d ▁by ▁the ▁distribution ▁of ▁features ; ▁for ▁example , ▁there ▁is ▁no ▁obvious ▁place ▁to ▁sleep . ▁ ▁The ▁surrounding ▁m ound ▁still ▁r ises ▁to ▁a ▁height ▁of ▁ ▁in ▁places , ▁and ▁calculations ▁suggest ▁an ▁original ▁volume ▁of ▁at ▁least ▁. ▁It ▁consists ▁primarily ▁of ▁sh atter ed ▁stone , ▁char co al , ▁and ▁ash . ▁Art ifact s ▁recovered ▁from ▁the ▁m ound ▁include ▁ham mer st ones , ▁pot ▁l ids ▁and ▁pot tery . ▁These ▁items , ▁combined ▁with ▁the ▁tank ▁and ▁hear th ▁found ▁in ▁the ▁building , ▁suggest ▁that ▁the ▁site ▁was ▁used ▁for ▁cook ing . ▁Bur nt ▁b ones ▁of ▁go at ▁and ▁sheep ▁support ▁this ▁interpretation , ▁which ▁was ▁put ▁to ▁the ▁test ▁with ▁an ▁experiment ▁in ▁Or k ney ▁where ▁a ▁leg ▁of ▁l amb ▁was ▁cook