Symboles graphiques à utiliser sur les cartes, les plans et les coupes géologiques détaillés — Partie 3: Représentation des roches magmatiques

Provides a unified series of symbols and ornaments for the representation of magmatic rocks. The symbols and ornaments may be divided in two groups as follows: principal types; varia. They have been reproduced in two tables which, being derived from a logical system, may be completed easily in case of need.