For information on North American 'super' volcanoes and flood basalts, see the Volcanoes of North America, Hawaii, Central America page.
"What are some examples of supervolcanoes?
Volcanoes that have produced exceedingly voluminous pyroclastic eruptions and formed large calderas in the past 2 million years include Yellowstone, Long Valley Caldera in eastern California, Toba in Indonesia, and Taupo in New Zealand. Other 'supervolcanoes' would likely include the large caldera volcanoes of Japan, Indonesia, Alaska (e.g. Aniakchak, Emmons, Fisher), and other areas." -- https://www2.usgs.gov/faq/categories/9819/2870