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Stratigraphy, scientific discipline concerned with the description of rock successions and their interpretation in terms of a general time scale.

It provides a basis for historical geology, and its principles and methods have found application in such fields as petroleum geology and archaeology.

Dating techniques are procedures used by scientists to determine the age of a specimen.

Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide a date in years.

It is a branch of geology that deals with the correlation, interpretation, and description of stratified sediments and rocks that are found on or below the surface of the earth.

Stratigraphy is a science that primarily deals with the study of layered sedimentary rocks (called strata) but may also include layered igneous rocks.

When excavating, techniques used are based on the principles of stratigraphy.

Absolute dates are also relative dates, in that they tell which specimens are older or younger than others.

Absolute dates must agree with dates from other relative methods in order to be valid.

These schemes, when used in conjunction with other dating methods—such as radiometric dating (the measurement of radioactive decay), paleoclimatic dating, and paleomagnetic determinations—that, in general, were developed within the last half of the 20th century, have led to somewhat less confusion of nomenclature and to ever more reliable information on which to base conclusions about Earth and natural gas almost always occur in stratified sedimentary rocks, the process of locating petroleum reservoir traps has been facilitated significantly by the use of stratigraphic concepts and data.stratigraphy to archaeology is the law of superposition—the principle that in any undisturbed deposit the oldest layers are normally located at the lowest level.

Accordingly, it is presumed that the remains of each succeeding generation are left on the debris of the last.

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