obsidian can be found where high silicate eruptions have happened. there are solid obsidian flows in the calderas of newberry volcano and medicine lake volcano in the cascade range of western north america, and at inyo craters east of the sierra nevada, california. yellowstone national park has a mountainside containing obsidian between mammoth hot springs and the norris geyser basin. deposits can be found in many other western us states including arizona, colorado, texas, utah, oregon and idaho. obsidian can also be found in armenia, turkey, italy, mexico, iceland, greece and scotland.