Photographs of travertine in Yellowstone
Photographs of travertine in Yellowstone. A) Travertine terraces actively forming at Mammoth Hot Springs. B) A few miles south of Mammoth Hot Springs, near Silver Gate, the highway passes through a landslide deposit composed of travertine blocks from Terrace Mountain; these travertines formed several hundred thousand years ago. C) A travertine deposit from the Hillside Springs Group near Old Faithful; this travertine formed 3,000-4,000 years ago (photograph taken under research permit YELL-2020-SCI-8030).