Two thick tephra deposits , collectively known as the Finlay tephras , are situated between sand , silt , mud and gravel in the Dease Lake and Finlay River areas . They both range in composition from phonolitic to trachytic and are high in iron ( II ) oxide , indicating that the tephras were likely extruded from a single volcano . Radiocarbon dating of terrestrial plant macrofossils directly overlying the youngest tephra deposit suggest an early Holocene age for this volcanic material . Because Level Mountain has received little scientific study and it is debated on whether or not Holocene volcanic rocks are present , the volcano is a possible source for these tephra deposits along with Hoodoo Mountain , Heart Peaks and the Mount Edziza complex
Finlay tephras
Finlay tephras
Level Mountain