How did the stone age begin

How did the stone age begin? People will think of the 4 million years ago when people just collect, hunting and fishing nature offered, life is like another clever mammals.The iron age is the third in the classification system for the ancient culture Bronze Age, the Stone Age before iron age are not the same time, the ancient different parts of the world.Limited use of iron in ancient times the Middle East as early as 3000 BC, according to the British encyclopedia, but the dominant metal is of brass.In archaeology iron age refers to the ancient historical period of the main raw materials manufacturing iron tools and weapons.Across the 1000 to 500 B.C., this during the second part of the iron age, see the rise of ancient Israel and fall, as the assyrians conquered north and south that the kingdom of Babylon people overran the kingdom.The Stone Age started 2.5 million years ago according to MSN encarta, this age is defined as the main raw material with tools.The antler harpoon, hunter of large water animals 20000 to between 10000 and years ago in Europe, is used to hunt whales harpoon seals and even swim land mammals like reindeer.