Mt Whitney Zone Forums General Discussion Mysterious fallen trees near Tioga entrance to YNP

There's another large source of obsidian in the Cosos.

It's quite common for find obsidian flakes thoughout the southern Sierra, Inyos, Cosos, and El Pasos. Once you know what to look for along the edges, it's easy to tell whether the flake occurred naturally, or whether it was done by a human.