All the pictures below are from Mammoth Hot Springs. There is a webcam overlooking the area located here (scroll down on page). This is a beautiful area with all the hot springs and minerals (calcium carbonate mostly). Terrace Mountain at Mammoth Hot Springs is the largest known carbonate-depositing spring in the world. The most famous feature at the springs is the Minerva Terrace, a series of travertine terraces. The terraces have been deposited by the spring over many years but, due to recent minor earthquake activity, the spring vent has shifted, rendering the terraces dry.