Tee Pee Rocks
Located one mile down Fossil Creek Road, off State Route 260, the Tee Pee Rocks are formally known as the Cottonwood Basin Fumaroles. The conical formations formed when ash from the nearby Hackberry Mountain volcano fell on calcium-rich waters of Lake Verde. When the calcium contacted the hot ash, it formed a cement-like material that resists erosion. The distinctive pockmarked holes in the cones formed when water eroded the base of the cones as they were slowly exposed from beneath the surrounding landscape. Geologist believe the fumaroles formed about 7 million years ago.