11. Historical maars and silicic lava domes are found along the Great Sumatran Fault line. 12. Characteristics can be sorted to infer subaqueous eruption or emplacement of silicic pyroclastic deposits. 13. Andesitic enclaves are also present and some dacites border on silicic andesite in composition. 14. The presence of silicic volcanic rocks such as rhyolite is also indicative of explosive eruptions. 15. Records of silicic eruptions begin with remnants from the Barroso formation, from the Miocene. 16. A 7 km?silicic lava flow lies on the saddle between the volcano and Acamarachi. 17. It is thought that fossils were pervaded with silicic acid due to this volcanic activity. 18. The mountains are remnants of ancient silicic volcanoes that have been worn down by erosion. 19. When this silicic lava emerges at the surface, it's highly gas-charged. 20. Udokan is the only volcanic field in the Baikal rift with silicic differentiation of its rocks.
