The Archean Red Lake greenstone belt in western Ontario consists of basaltic and komatiitic volcanics ranging in age from 2,925 to 2,940 million years old and younger rhyolite-andesite volcanics ranging in age from 2,730 to 2,750 million years old.[34] It is situated in the western portion of the Uchi Subprovince, a volcanic sequence comprising a number of greenstone belts.[35]