One hundred and two new K-Ar age determinations, largely from granitoid rocks, are reported from the Saint Elias Mountains of southwest Yukon, northwest British Columbia, and closely adjacent parts of Alaska. Six new K-Ar dates are also presented for rocks in the
northern part of the Coast Plutonic Camplex. New and previously published K-Ar age data from the Saint Elias Mountains aid in defining at least six plutonic episodes in this region: latest Pennsylvanian to Early Permian (270-290 Ma); Late Jurassic to earliest Cretaceous (130-160 Ma); late Early
Cretaceous (106-117 Ma); Eocene (41-52 Ma); Oligocene (23-33 Ma); and mid- to Late-Miocene (6-16 Ma) time. Ali can be correlated with plutons or plutonic belts previously outlined in adjoining Alaska. ln the Saint Elias Mountains the plutonic episodes, except for the fast two, are apparently
confined to certain terranes, whereas equivalent plutons or plutonic belts in Alaska mostly are not. These six distinct episodes of mainly calc-alkaline plutonism in structurally camplex Saint Elias Mountains and in contiguous Alaska, may be, but are not necessarily, related to periods of plate
convergence and subduction.
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