To re-create the flow of events and cultural stratigraphy, scientists turn to sequence dating. In an era prior to C14, DNA analysis and other modern methods of investigation sequence dating provided context and relevance to the matrix of discovery.
We have some thoughts on how this relates to human memory and classifying human thinking into an encyclopedia neuropyschologica that embraces the full gestalt of experience. When the thoughts are full-blown, we'll share them. So, check back later today or this evening.