According to this system, humans passed through three distinct stages of technological development, based on the primary material used to manufacture tools and weapons: the Stone Age, the Bronze Age, and the Iron Age.
Biological criteria can also serve as a means for relative dating.
From this, scientists can establish pollen diagrams (describing the relative abundance of different pollen-producing plants at a given point in time) and floral time charts (showing how climate and flora changed over time).
When the place is mentioned in the date of a deed, the law intends, unless the contrary appears, that it was executed at the place of the date.
In geology, a master stratigraphic sequence for a particular region is built up by correlating the strata from different locations with one another.
As new locations are investigated, the geologist attempts to fit the new profiles into the master sequence of geological strata for that region.
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