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During the Miocene and Pliocene, a volcanic field occurred in British Columbia's Interior Plateau. The basalt is assumed to cover up to 50,000 km2 of the Pacific Northwest. It forms a medium-sized large igneous province, of volume 3300 km3.
Volcanism still continues from time to time. Eruptions were most vigorous 6–10 million years ago (mya) and 2–3 mya, when most of the basalt was released. Smaller eruptions continued from 1.6 mya to 0.01 mya.
- Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia Retrieved on 20012-09-22
- National Resources Canada - Catalogue of Canadian volcanoes: Chilcotin Plateau basalts Retrieved on 2008-03-15