IS 7422 : Part 2 : 1974 Symbols and abbreviations for use in geological maps, sections and subsurface exploratory logs: Part 2 Igneous rocks

1. Scope

1.1 This standard (Part II) covers symbols for igneous rocks for use in geological maps, sections and logs of bore holes, test pits, exploratory drifts and shafts for river valley projects. Rock types covered in the standared are restricted to ghose commonlu met with in engineering practice.