The Klastline Formation is a stratigraphic unit of Pleistocene age in northwestern British Columbia, Canada.
[5] It consists of shield volcanoes, stratovolcanoes, cinder cones and lava domes that have formed in the last 12 million years.
[1][6] The Klastline Formation was emplaced during the fourth magmatic cycle of the Mount Edziza volcanic complex.
[1][2] It occurs along the valleys of Kakiddi Creek and the Klastline River where it forms isolated, usually flat-topped erosional remnants with 6-to-12-metre (20-to-39-foot) high escarpments.
[4] A K–Ar date of 0.33 ± 0.03 million years has been obtained from the top of a Village Member basalt flow on the Tahltan River, suggesting that Klastline volcanism may have been coeval with that of the Kakiddi Formation.