most geological scholars will contend that most of bangladesh was fashioned 1 to 6.5 million years ago during the tertiary era. semi-recent excavations in the deolpota village of western bengal seem to suggest that a paleolithic civilization in the region existed about one hundred thousand years ago. a 10,000 to 15,000 year old stone structure in rangamati is the primary evidence of paleolithic civilization along with a hand axe found in the mountainous inclines of the feni district. this neo-stone age began 3,000 bc lasting almost 1500 years. similar tools were found in sitakunda of the eastern region chittagong, and near comilla district. the sparsely forested hills in eastern bengal strewn with fertile valleys imparted a hospitable location for neolithic settlements.