(top, down) Sulfur Works is thought to be the remains of Mount Tehama's central volcanic vent. It is in the middle of the Brokeoff-Diller-Pilot-Conard circle of peaks that are thought to define the flanks of ancient Mt Tehama (see map).
(top, down) Stinky hydrogen
sulfide fumes were bubbling up from underground.
(top, down) Sulfur
chemicals and microbial growths made colorful patches on the hillsides.