The town of Mammoth Lakes lies on the edge of a truly remarkable ongoing geological event site known as the Long Valley. Join The Sierra Club Range of Light Group to learn about: Highlights of Long Valley - A unique geology, a rich cultural past, a long history of ranching, geothermal development, now recreation The Present

The town of Mammoth Lakes lies on the edge of a truly remarkable ongoing geological event site known as the Long Valley. Join The Sierra Club Range of Light Group to learn about: Highlights of Long Valley - A unique geology, a rich cultural past, a long history of ranching, geothermal development, now recreation The Present

The town of Mammoth Lakes lies on the edge of a truly remarkable ongoing geological event site known as the Long Valley. Join The Sierra Club Range of Light Group to learn about: Highlights of Long Valley - A unique geology, a rich cultural past, a long history of ranching, geothermal development, now recreation The Present