Several rock types with varying chemical compositions make up Level Mountain. Ankaramites and alkali basalts are the primary volcanic rocks comprising the basal shield. Alkali basalts form columnar jointed lava flows, vesicular lava flows, dikes and scoria while ankaramites are present as dark-coloured lava flows with several columnar cooling units. Trachybasalts, phonolites, trachytes, peralkaline trachytes, pantellerites, comendites and rhyolites form the overlying stratovolcano and domes. They comprise dikes, welded tuffs, pitchstones, volcanic plugs, laccoliths and flows. Trachybasalts are in the form of two textural types: phenocryst-rich lava flows and fragmental flow agglomerates. Phonolites are vesicular and pumiceous in nature, although phonolites with trachytic texture are also present. Trachytes and peralkaline trachytes are the primary volcanic rocks in the Level Mountain Range. Comendites appear to have erupted fluidly, forming lava tubes. Rhyolites are in the form of stubby lava flows and domes.