sentences:  However, the uneroded structure of the cone with the existence of trees on its flanks and summit have it an area for dendrochronology studies, which reveals the growth of tree-ring patterns.Tree-growth data has revealed an age of 400 years for Kostal Cone, making it the youngest volcano in the Wells Gray-Clearwater volcanic field and one of the youngest volcanoes in Canada.Kostal Cone is made of fragmented and solidified lava called cinder and its summit contains a bowl-shaped crater.