Overview of the relationships between the reference systems (in blue), geological description of a geological feature, and mapped features. Geometries correspond to different geological features which may be lithotectonic/paleogeographic units (domain reference system) or lithostratigraphic units (lithostratigraphic reference system). A polyline may correspond to a structural unit (structural reference system). The geological events (geological-event reference system) are linked to a geological feature, of which a description of metamorphism/alteration/sedimentation/magmatism/tectonism has to be first realized. In that sense a geological feature can have numerous successive process/environment attributes, that may be linked (or not) to geological events from the reference system.