Biscuit Basin
This thermal basin is particularly volatile, unpredictable. On August 17, 1959, an earthquake recorded at 7.5 on the Richter scale had its epicenter just a few miles to the northwest.
Four days later, Sapphire Pool began to erupt violently, blowing away the large rock biscuits around the crater. Biscuit Basin was named for those biscuit-shaped mineral formations.
Courtesy hmdb.org
