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Pre- Historic Bangladesh Md.Adnan Arif Salim Aurnab Pre-History is common word used specially by the Archaeologist as well as the historians that indicates the time before history. It is the time when no literary documents are available through which an Archaeological researcher or historian could able to realize the proper condition. Only a few stone made or other tools cling to this time human behavioral activities or culture had been found .These stone tools on the one hand not a clear way to realize and reconstruct human culture .On the other hand took the Archaeological researchers at a gigs haw puzzle as well as provides the field pseudo archaeology that is the way of corruption in past research .However, the Bengal basin or modern Bangladeshi landscape had been used widely for the development of human settlement since the prehistoric age . It’s a clear phenomena that the Himalayas in the north protect the Bengal basin from the extreme cold and the dry air from the desert of Thar at Rajasthan .The country enjoys a lot of rainfall due to monsoon and a number of river on this basin full in to the brim during rainy season carried a large amount of silt had been made the landscape suitable for cultivation .For this purpose people here get a lot of opportunity to get a lot of crop so do the foundation to form a Pre-historic habitation . The term "prehistory" can be used to refer to all time since the beginning of the universe, although the term is more often used to describe the period when there was pre human-like beings appear on Earth and trying to develop their livelihood. But each and every religion is dead against this type of thinking. Prehistorian typically uses a three age system to divide up human prehistory. The three-age system is the periodization of human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies ,tools quality ,use, and using condition. I like to mention this as follow- Paleolithic  Lower Paleolithic: Two types Abbevillian or the first ever man made tools used culture and Achulian hand axe and clever is the main tools used by human being in this culture.  Middle Paleolithic: This age usually mentioned as the period of flake culture when different types of scraper is used as main tools.  Upper Paleolithic : Different types of minerals used as tool making implement identified this period as the Flint culture. The minerals are jesper ,quartzite, opal ,chalcedony and so on. Mesolithic: Specially known as microlithic culture in spite of random migration the people of that period used more lighter tools than any other period of stone age Neolithic : Hand axe is the main tools of that period mentioned this culture as the Hand axe culture . Because of permanent settlement again the people started to use heavier tools like the Paleolithic period .It is to say that core of pebble specially used to prepare tools mentioned this the core culture by name.