Further cultural subdivisions according to tool types, such as Olduwan or Mousterian or Levalloisian help archaeologists and other anthropologists in understanding major trends in the human past.
I tizunawen n agna tiyyad s ich-ikilan n asuj chund Mlduwan meɣ Mouterian meɣ Levalloisian idhalan archaeologist tan d anthropologist tan iyyad daɣ afaham n isatoɣan daɣ tikit n awadim