<Li> Yellowstone hotspot, Steens and Columbia River flood basalts, Pueblo, Steens, and Malheur Gorge - region, Pueblo Mountains, Steens Mountain, Washington, Oregon, and Idaho, USA; most vigorous eruptions were from 14--17 Ma; 180,000 cubic kilometers (43,184 cu mi) of lava . </Li> <Li> Mount Lindesay (New South Wales), Australia; is part of the remnants of the Nandewar extinct volcano that ceased activity about 17 Ma after 4 million years of activity . </Li> <Li> Oxaya Ignimbrites, northern Chile (around 18 ° S); 19 Ma; 3,000 cubic kilometers (720 cu mi) of tephra . </Li> <Li> Pemberton Volcanic Belt was erupting about 21 to 22 Ma . </Li>

When did the first volcano appear on earth