A second geothermal field related to Cerro Blanco is located south of the volcano and is known as Los Hornitos or Terma Los Hornos. It is located in a ravine and consists of three clusters of bubbling pools, hot springs, up to high travertine domes that discharge water and extinct geyser cones; these cones give the field its name and some of them were active until 2000. Water temperatures range between , the vents are settled by extremophilic organisms. The springs deposit travertine, forming cascades, dams, pools and terraces of varying size. Fossil travertine deposits are also found and form a carbonate rock plateau. South-westward trending fault systems might connect it to the Cerro Blanco magmatic system.