What is Fossil Falls: It is an area with unique geologic features. The area was part of the Coso Volcanic Range, which was an active volcanic area thousands of years ago. Some of the remnants of this volcanic activity can be seen in the form of a cinder cone, Red Hill, which is next to Fossil Falls. The other remnants of this volcanic activity are the “falls” themselves, which is a large area of basalt (hardened lava). This large sheet of basalt blocked portions of ancient Owens River, and probably portions of the Owens Lake. The significance of this is that during the last ice age, water from receding glaciers (and the river and lake) flowed over this basalt, smoothing it, eroding it, and forming the canyons and holes that remain today over a period of thousands of years. Today, what remains is smooth basalt that has eroded into a distinctive geologic area. (For more information click here and here).