section_path: Areas of study/Periods/Prehistoric periodization
section_name: Prehistoric periodization
paragraph_text: Prehistoric periodization
  
  The field of history generally leaves prehistory to archeologists, who have entirely different sets of tools and theories. In archeology, the usual method for periodization of the distant prehistoric past is to rely on changes in material culture and technology, such as the Stone Age, Bronze Age, and Iron Age, with subdivisions that are also based on different styles of material remains. Here prehistory is divided into a series of "chapters" so that periods in history could unfold not only in a relative chronology but also narrative chronology. This narrative content could be in the form of functional-economic interpretation. There are periodizations, however, that do not have this narrative aspect, relying largely on relative chronology, and that are thus devoid of any specific meaning.
  
  Despite the development over recent decades of the ability through radiocarbon dating and other scientific methods to give actual dates for many sites or artefacts, these long-established schemes seem likely to remain in use. In many cases neighboring cultures with writing have left some history of cultures without it, which may be used. Periodization, however, is not viewed as a perfect framework, with one account explaining that "cultural changes do not conveniently start and stop (combinedly) at periodization boundaries" and that different trajectories of change need to be studied in their own right before they get intertwined with cultural phenomena.