Parasitic cones of the Itcha Range shield were formed mainly during the Early Pleistocene mafic capping stage between 2.2 and 0.8 million years ago. These secondary vents are monogenetic in nature, meaning each cone was only active for a single eruption sequence before becoming extinct. The duration of volcanic activity at these cones can last from hours to years. Parasitic cones of the Itcha Range are small cinder cones situated at the summit and flanks of the shield volcano.