= stratigraphy, n.

The branch of geology that is concerned with the order and relative position of the strata of the earth's crust. Also in extended use with reference…

= chronostratigraphy, n.

The branch of stratigraphy concerned with the age of strata on an absolute scale (i.e. in terms of years).

Stratigraphy based on the polarity of the remanent magnetism of rock strata, which constitutes a record of the periodic reversals of polarity in…