▁ 0 ▁or ▁ 1 ). ▁Among ▁these ▁spec im ens ▁include ▁an ▁ext inct ▁r hin oc eros ▁( D ic er or hin us ▁et rus cus ▁et rus cus ), ▁horse ▁( Equ us ▁st en on is ), ▁de er ▁( C erv us ▁per rier i ), ▁and ▁a ▁sab er ▁to oth ed ▁cat ▁( M eg an tere on ). ▁ ▁Str at ig raph y ▁and ▁d ating ▁ ▁The ▁D man isi ▁arch ae ological ▁site ▁has ▁been ▁extens ively ▁dated ▁through ▁multiple ▁methods ▁to ▁approximately ▁ 1 . 8 - 1 . 7 ▁Ma . ▁The ▁initial ▁publication ▁of ▁the ▁discovery ▁of ▁Sk ull ▁ 1 ▁( 2 2 8 0 ) ▁and ▁Sk ull ▁ 2 ▁( 2 2 8 2 ) ▁provided ▁five ▁d ating ▁methods ▁to ▁support ▁this ▁date : ▁▁ ▁K - Ar ▁and ▁ 4 0 Ar / 3 9 Ar ▁d ating ▁on ▁the ▁Mas aver a ▁Bas alt ▁ ▁Pale om agnet ic ▁correlation ▁with ▁the ▁Old u va i ▁Ge om agnet ic ▁Sub chron ▁ ▁Late - P lio - P le ist oc ene ▁verte br ate ▁fa una ▁ ▁H omin in ▁morph ology ▁similar ▁to ▁early ▁African ▁H . ▁ere ct us ▁( H . ▁erg aster ) ▁ ▁Old owan ▁( Mode ▁ 1 ) ▁stone ▁tools ▁ ▁A ▁majority ▁of ▁the ▁fa unal ▁foss ils ▁are ▁fairly ▁well ▁preserved ▁due ▁to ▁rapid ▁bur ial ▁and ▁relatively ▁gentle ▁post -