https://ctech.com/studio_help/file-format-details/lsdv-lithology-screen-data-value-file-format/index.htmlLSDV Lithology Screen Data Value File Format The LSDV lithology file format can be used as a more feature rich replacement for the older PGF format. It has the following advantages: Fully supports non-vertical borings Supports missing intervals and lithology data which does not begin at ground surface Provides an Explicit definition of each lithologic interval An explanation of the file format follows:Hugoen-us