▁" .. the ▁hypothesis ▁of ▁a ▁deep ▁cl ad ogen esis ▁between ▁African ▁and ▁Asian ▁H . ▁ere ct us ▁... "; ▁and ▁ 2 ) ▁" .. that ▁ge ographic ▁sub div ision ▁of ▁early ▁H . ▁ere ct us ▁into ▁separate ▁species ▁line ages ▁is ▁bi olog ically ▁mis leading , ▁artificial ly ▁infl ating ▁early ▁Ple ist oc ene ▁species ▁divers ity ." ▁ ▁Further , ▁they ▁suggest ▁that ▁" .. by ▁ 1 ▁My r ▁the ▁tax on ▁had ▁colon ized ▁much ▁of ▁the ▁Old ▁World ▁without ▁spe ci ating . ▁A ▁finding ▁of ▁considerable ▁bi oge ographic ▁and ▁behaviour al ▁significance ". ▁ ▁Her to ▁The ▁Her to ▁layers ▁consist ▁of ▁a ▁ 1 5 – 2 0 ▁m ▁thick ▁main ▁sequence ▁found ▁in ▁the ▁south western ▁part ▁of ▁the ▁Bou ri ▁pen ins ula . ▁The ▁division ▁between ▁the ▁Lower ▁and ▁Upper ▁Her to ▁layers ▁is ▁character ized ▁by ▁an ▁er os ion ▁surface ▁filled ▁with ▁rounded ▁p eb bles . ▁ ▁Lower ▁Her to ▁This ▁layer ▁presents ▁l ign ite , ▁ve ins ▁of ▁p ink ▁carbon ate , ▁and ▁sil ty ▁cl ays ▁( of ▁pre domin antly ▁lake ▁origin ) ▁containing ▁g ast rop od ▁and ▁b ival ve ▁foss ils ; ▁it ▁is ▁dated ▁to ▁ 2 6 0 ▁thousands ▁of ▁years ▁ago ▁( ky a ). ▁Late ▁A che ule an ▁tools ▁are ▁found ▁associated ▁with ▁hom in in ▁remains ▁as ▁yet ▁un class ified . ▁Hum ans ▁in ▁this ▁habitat ▁lived