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As new locations are investigated, the geologist attempts to fit the new profiles into the master sequence of geological strata for that region.The depth of the strata within the master sequence provides the investigator with the relative date of any particular profile.With sites on the internet, you can never know exactly who you're talking about.
In absolute or chronometric dating, the investigator establishes the age of an object or event in calendar years.
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Before the 20th cent., archaeologists and geologists were largely limited to the use of relative dating techniques.
Estimates of the absolute age of prehistoric and geological events and remains amounted to little more than inspired guesswork, as there was no scientific basis for testing such proposals.
Stratigraphic dating assumes that the lower layers in any particular profile are older than the upper layers in that profile ("the law of superposition") and that an object cannot be older than the materials of which it is composed.