Yva Momatiuk & John Eastcott / Minden / Calcium tufa formations, Mono Lake, California

Alex Hyde / Water cascading over naturally formed tufa dam. Tufa is a kind of limestone, formed from the precipitation of carbonate minerals which builds up around mosses and water plants to form a solid limeston...

Gavin Hellier / Volcanic tufa rock formations, Uchisar, Cappadocia, Anatolia, Turkey, 2008

Marie Read / Osprey (Pandion haliaetus) taking flight from tufa tower carrying a fish, Mono Lake, California, USA

Jack Dykinga / Engelmann spruce (Picea engelmannii) growing amongst pinnacles of volcanic tuff, dawn, Wheeler Geological Area Wilderness, Rio Grande National Forest, Colorado, USA

Jack Dykinga / Tufa pinnacles in the sunset afterglow at the edge of Mono Lake, Mono Lake State Reserve, California, USA

Tim Fitzharris / Full moon over Mono Lake with wind and rain eroded tufa towers and the eastern Sierra Nevada Mountains in the background, California

Tui De Roy / Cerro Azul caldera with lake and tufa cone at 5,900 feet, Cerro Azul Volcano, Isabella Island, Galapagos Islands, Ecuador

John Shaw / Trona Pinnacles, tufa towers that are a USA National Natural Landmark, near Trona, California, USA, January.

Marie Read / Wilson's Phalaropes (Phalaropus tricolor) flock flying over tufa formations at Mono Lake in late summer, with reflection, California, USA. July 2013. Mono Lake is an important staging site for sho...

Marie Read / Wilson's Phalaropes (Phalaropus tricolor) large flock on the shore at Mono Lake in late summer, California, USA. July. Mono Lake is an important staging site (stopover site) for migrating shorebir...

Yva Momatiuk & John Eastcott / Minden / Great Horned Owl (Bubo virginianus) pair on calcium tufa formation, Mono Lake, California