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      Stratigraphy is a branch of geology studies stratification of the rocks and their superposition. It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy includes three main subfields: chronostratigraphy, lithostratigraphy and biostratigraphy. For more information, see International Comission on Stratigraphy.
Img. 3:
.Stratigraphy of the Barrandian area (after Chlupáč 2002)

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]