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.
Igneous masses are dated according to whether they caused metamorphism in the surrounding rock (proof of emplacement in preexisting rock) or whether sediments were deposited on them after they were formed.
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.
the determination of the age of an object, of a natural phenomenon, or of a series of events.
Deeds, and other writings, when the date is an impossible one, take effect from the time of deliver; the presumption of law is, that the deed was dated on the day it bears date, unless, as just mentioned, the time is impossible; for example, the 32d day of January. The proper way of dating, is to put the day, month, and year of our Lord; the hour need not be mentioned, unless specially required; an instance of which may be taken from the Pennsylvania Act of the 16th June, 1836, sect. 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.Stratigraphic dating is accomplished by interpreting the significance of geological or archaeological strata, or layers.The seriation of stratified deposits permits archaeologists to assess the relative age of particular styles.This information may then be used to surmise the relative age of unstratified deposits (e.g., surface sites).