2.2 Names of formal units
2.2.1 The reason for having formal units
Formal geological units are to be defined with the aim in view that the names given to them will be able to function for a long time retaining a stable, unambiguous geological significance. The name is to be used (a) on official geological maps, (b) in published scientific works and technical reports, and (c) in other reports and documents connected with business, public administration and administrative bodies of a political nature. The practical need for a unit, and a certain level of knowledge about it, will need to be demonstrated before the unit can be formally defined and erected.