Up at 11,200ft just east of Mammoth in California, Glass Mt is unique in that it is primarily made of obsidian, which in places shows

W6PNG/M0SNA
Up at 11,200ft just east of Mammoth in California, Glass Mt is unique in that it is primarily made of obsidian, which in places shows
I love the great outdoors and in January 2012 I took the opportunity to stop while driving through an uncharacteristically open Tioga Pass in Yosemite.