Stratigraphy
Stratigraphy is a branch of geology, is the basic disciplines of geology, is developed in the early 19th century a discipline, the first used to study the sedimentary rocks and volcanic eruptions of the sequence. Current research includes the stratigraphic age and geographical distribution, stratigraphic classification, and the relationship between the various rocks. Stratigraphy can be divided into rock stratigraphy, biostratigraphy and chronostratigraphy according to the main research objects. ...