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).The principle of stratigraphic dating is used to establish the relative age of these floral and fossil assemblages.However, as the basic principles of relative dating progressed during the course of the 19th cent., investigators were able to correctly determine the relative age of many archaeological and geological materials.
The method begins with the careful drawing and description of strata (the geological or archaeological profile).The profile from one location is then compared with profiles from surrounding sites.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.Relative dating is a dating method that used to determine determine the relative ages of geologic strata, artifacts, historical events, etc.
This technique does not give specific ages to items.
These techniques were first articulated by Nicolas Steno, a Dane living in the Medici court of Italy in the 17th C.
Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods.
Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.
Relative dating helps determine what came first and what followed, but doesn't help determine actual age.
Relative dating uses observation of location within rock layers, while radiometric dating uses data from the decay of radioactive substances within an object.