目前C.H.斯托克韦尔(Stockwell)对他所提出的加拿大地盾前寒武纪年表的年龄值进行了修正(见表)。同较早公布的一样,造山运动的终结被选作时间划分的界限,但现在已把造山年龄和造陆(或冷却)年龄区分开了。造山运动终结的时间位于最年青造山相和紧接着而来的造陆冷却时间开始之间相当短的间隔之内。伟晶岩一般是最年青的造山物质,其年龄可以用U-Pb法测定。造陆冷却时间开始的时代是用K-Ar法对造山成因角闪石进行的严密测定而测 Currently Stockwell corrects the age value of the Precambrian chronology of his Canadian shield (see table). As announced earlier, the end of the orogeny was chosen as the time-division but now the orogenic age has been separated from the land-making (or cooling) age. The end of the orogeny is located within a relatively short interval between the youngest orogenic phase and the start of the immediate landfill cooldown. Pegmatite is generally the youngest orogeny and its age can be measured by the U-Pb method. Land reclamation time began when the K-Ar method was used to determine the causes of orogenic amphibole