Prehistory is the time before written records, so as a time period it will vary in different parts of the world according to when written records first were laid down in any given area, in Mesopotamia and Egypt prehistory ended around 3500 bc, in much of Sub Saharan Africa it only ended in the last 500 years.
As to what periods are in the prehistoric times, well everything from the creation of the universe to the dinosaurs right up until the bronze and iron ages in certain areas.
thanks, thus, the people enter the history with using any writing sytem. some poeple used scripts that their dates are desputed, this means that the end of their prehistory would be desputed too.
the prehistory is devided in three main periods: the stone age, the bronze age, and the iron age. the stone age is again to devide in three ages: the paleothic age, the mesolithic age, and the neolitic age.
the paleothic age is again to devide in three phases:the lower paleothic period, the middle paleothic, and the upper paleothic period. the mesolitic era is the phase situated betwen the paleothic- and the neolithic age. but some scholars believe that mesolithic period didn't occur in all the world.
another question: what does "the man of the prehistory" mean ?
the ancient egyptians wrote about the berbers in about "3,000 b.C". the berbers entered ,thus, the history in 3,000 b.C., Isn't it ? How about the drawings ? the berbers are registered in a pre-dynastic depict.
I think that historic records of a population should be consistant and even kept by the population itself in order to make them pass from prehistory to history. Tacitus wrote about the "Fenni", probably referring to the ancestors of Sami, since he spoke of pure hunter-gathers, and Finns were mentioned in the ancient Norwegian and Icelandic Sagas. Still, Finns strictly speaking only entered history in the late 12th century, when references of Finns and events taking place in modern Finland became consistant both in Novgorodian and Western European sources.