Reporting a radiometric date of a hypogene mineral or plutonic rock as a date of orogeny is unjustified. Many orogenies proceed without associated plutonism and many plutonic events take place without orogeny. Stratigraphic terms should not be used for tectonic or plutonic events unless the events are concurrent with the deposition of the strata. The term 'Grenville' has become meaningless because it has been used as a stratigraphic, provincial, tectonic and orogenic term spanning a great length of time and obscuring the tectonic and plutonic events of the Precambrian. 'Grenville' should be used as a stratigraphic term only and new names coined for restricted plutonic and tectonic events which involve rocks of the Grenville series.