"Sulphur Works hydrothermal area sits at the center of a wide basin surrounded by towering volcanic peaks. Geologists have determined that the encircling peaks (Brokeoff Mountain, Mount Diller, Pilot Pinnacle, and Mount Conard) are all remnants of a large, eroded volcano called Brokeoff Volcano, or Mount Tehama."

"Sulphur Works is a vent for the last rumblings of a long-dead volcano and yet it is also reborn each day as forces of erosion and hydrothermal activity continuously alter the landscape. Although named after the chemical element of sulfur—which is a byproduct of the hydrothermal system—the area bears the British English spelling of the word assigned by a pioneer that once laid claim to what was then known as Supan's Sulphur Works."