Stratigraphy is the study of layered rock sequencesparticularly in terms of their agecorrelation with equivalent rocks elsewhere. It has many different branches of which some of the most fundamental are lithostratigraphybiostratigraphychronostratigraphy. Lithostratigraphic subdivisions are those normally depicted on geological maps and most commonly encountered in ground engineering. However, because of local variations it is arguable that lithostratigraphic classifications are of only limited use for site-specific engineering, given that subdivisions are based on generally broad physical characteristics aimed at wider regional correlations. Practical use of stratigraphic subdivisions in ground engineering is further hindered by periodic changes to their nomenclature that has caused confusion to non-specialists not fully aware of the reasons for making such changes. Despite these apparent limitations, recent research into the geotechnical characteristics of the Lias Group and Lambeth Group deposits in the UK has shown how lithostratigraphy can aid in anticipating regional trends in engineering properties. The studies have also demonstrated how understanding regional geological controls can enhance site specific knowledge, leading to more focussed and cost effective ground investigation planning.