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Culture history and diffusionism may - with hindsight - seem excessively preoccupied with classification and social evolution, and to have applied unsophisticated historical interpretations instead of asking fundamental questions about human behaviour.One of the most widely used methods of determining the absolute date of organic materials is radiocarbon (carbon 14) dating .Because all living organisms contain a radioactive form of carbon (carbon 14) that decays at a known and steady rate, archaeologists can determine an organic object's age (if it is less than 40,000 years old) by measuring the amount of carbon 14 remaining in the object.Seriation was developed in the USA to place in order finds from strata or other kinds of assemblages such as potsherds collected from the surface of sites.Prehistorians sometimes overestimate the accuracy and detail of frameworks based on historical evidence; in practice, early written sources may provide little more information than a scatter of radiocarbon dates.In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.