 The first was a generalisation of the name of the new class of planets (previously the draft resolution had explicitly opted for the term 'pluton'), with a decision on the name to be used postponed.Many geologists had been critical of the choice of name for Pluto-like planets, being concerned about the term pluton which has been used for years within the geological community to represent a form of magmatic intrusion; such formations are fairly common balls of rock.Confusion was thought undesirable due to the status of planetology as a field closely allied to geology.