2.2.9 Changes in the official way of writing proper names
If a change takes place in the official way of spelling a geographical or other name that is being used as a proper or characterizing name for a formal geological unit, the new version is to be used provided the change is insignificant and will not lead to misunderstanding. If the type section, type locality or type area is given an entirely new name on new editions of topographical maps, the name originally assigned to the unit is to be retained.