Travertine. Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ archive copy at the Wayback Machine ; English Wikipedia
English In western Turkey, Pamukkale travertine pools and terraces form the largest such complex in the world. For thousands of years, people have visited
discharged each day at a constant 70°F. The high mineral content leaves travertine dams and deposits, giving rise to fossil-like features. In 2005, Arizona
area InfoField Arizona Features InfoField GRAND CANYON, COLORADO RIVER, TRAVERTINE CANYON Cloud percentage InfoField 10% Altitude InfoField 188 nautical