 Throughout the Holocene epoch , the Anahim hotspot has energized numerous volcanoes . This volcanic activity has produced numerous Hawaiian eruptions , which created lava fountains , small cinder cones and lava flows . The youngest expression of the Anahim hotspot is Nazko Cone , which formed about 340 @,@ 000 years ago . The most recent eruptive activity at Nazko Cone occurred about 7 @,@ 200 years ago . This is very recent in geological terms , suggesting that the volcano may yet have some ongoing volcanic activity . The Rainbow Range is the largest Anahim volcano , although Nazko Cone is now the site of the most intense volcanic activity , located directly on top of the Anahim hotspot at . Its last eruption started with an eruption of two different progressions of runny lava flows , which resulted in an older , grey basalt becoming overlain by a younger , darker black basaltic lava flow . The passive eruptions were followed by a period of explosive eruptions . This explosive activity built three overlying cinder cones that broke by the two lava flows near the end of the explosive phase of activity . The last phase of explosive activity spread tephra to the north and east of the cones . The deepest deposits near the cone are less than 3 m ( 10 ft ) ; that they thin to less than a few centimetres only a few kilometres away , suggests that the explosive eruptions at Nazko Cone were fairly small . However , the last eruption from Nazko Cone could have started forest fires , since there is charcoal inside the tephra layer . 
