Abstract
The following five new potassium-argon dates are reported: In the area between the Campbell and Priestley Glaciers emplacement of the post-tectonic part of the Granite Harbour Intrusive Complex and localised metamorphism of the Ross Supergroup took place during the Ross Orogeny between 400 and 530 m.y. The epizonal Admiralty Intrusive Group was emplaced later between 300 and 385 m.y., and was not accompanied by any regional metamorphism.

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