 Another geothermal system is known as La Colcha and includes fumaroles as well as boiling water and sinter deposits; it has been prospected for the possibility of geothermal power generation.The basement beneath the caldera consists of 600–365 million years old metamorphic and sedimentary rocks of Precambrian to Paleozoic age.These include intrusions of granitoid character and are overlain with Paleozoic marine sediments.