Some Definitions Sedimentology is the study of sedimentary rocks and, in particular how they form. Stratigraphy is the science of rock strata. The distinction between sedimentology and stratigraphy has become blurred. Sedimentary petrography is the description and classification of sedimentary rocks. The word petrography suggests the study is done using the petrographic microscope.
Sedimentary petrology is the study of the composition and origin of sedimentary rocks.