11. In contrast, lava from the summit flowed over pyroclastic rocks and lava flows of the explosive phase. 12. The oldest exposed sequence is the Ol Njorowa pantellerite formation of pyroclastic rocks , lava flows and plugs. 13. The Canadian portion of the field is dominated by scattered remnants of upper Cenozoic subaerial lavas and pyroclastic rocks . 14. Pyroclastic rocks are often the result of volcanic debris, such as bombs and tephra, and other volcanic ejecta.15. These volcanic pipes are genetically associated with the rhyolitic, pyroclastic rocks that cover the whole southern part of Antiparos. 16. In addition felsic pyroclastic rocks are very common in places and one sandstone-conglomerate lava flow can be found. 17. It is a stratovolcano, composed of many layers of lava alternating with hardened volcanic ash and other pyroclastic rocks . 18. Pyroclastic rocks may be a range of clast sizes, from the largest agglomerates, to very fine ashes and tuffs.19. The main volcanics at Hoodoo Mountain are phonolite and comendic trachyte lavas and hyaloclastites, although some pyroclastic rocks also exist. 20. The pyroclastic rock and the base surge deposits form an ash volcanic cone, while the ash covers a large surrounding area.
