More than 20 eruptions have occurred at the Mount Edziza volcanic complex in the past 10,000 years, including Mess Lake Cone, Kana Cone, Cinder Cliff, Icefall Cone, Ridge Cone, Williams Cone, Walkout Creek Cone, Moraine Cone, Sidas Cone, Sleet Cone, Storm Cone, Triplex Cone, Twin Cone, Cache Hill, Camp Hill, Cocoa Crater, Coffee Crater, Nahta Cone, Tennena Cone, The Saucer and the well-preserved Eve Cone. These cinder cones were formed no more than the year 700 based on the age of burnt plant stems still rooted in former soil under of loose basaltic fragments. The cones were built on the basaltic fragments and blocky lava fields surrounding the cones. The Snowshoe Lava Field on the southern end of the Big Raven Plateau is one of the areas of young lava flows in the region while the Desolation Lava Field on the northern end of the Big Raven Plateau is the largest area of young lava flows, covering an area of . The longest lava flow is . This volcanic activity was followed by at least two younger, but still undated eruptions.