... Although it is true that geologists call a lithified sand a sandstone regardless of age or hypothetical origin, it is equally true that degree of lithification plays no part in the stratigraphy of sediments. ... If you are describing a lithified sedimentary sequence with buried soils, it stands to reason that they would be lithified too. ... A geosol has to be buried where it is defined; otherwise, its stratigraphic position cannot be recognized. ...