Jack Dykinga / Engelmann spruce (Picea engelmannii) growing amongst pinnacles of volcanic tuff, dawn, Wheeler Geological Area Wilderness, Rio Grande National Forest, Colorado, USA
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Jack Dykinga / Tufa pinnacles in the sunset afterglow at the edge of Mono Lake, Mono Lake State Reserve, California, USA
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Gavin Hellier / Hot Air Balloon flight over the famous Volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Elevated view over the Volcanic tufa rock formations surrounding Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Elevated view over the Volcanic tufa rock formations surrounding Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape including the Rock Church of St John the Baptist in Cavusin, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Hot Air Balloon with the Worlds largest passenger basket just above the tufa rock formations near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Man tending his vineyard in front of Tufa rock formations in the Rose Valley near Goreme, Anatolia, Turkey, 2008
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Marie Read / Wilson's Phalaropes (Phalaropus tricolor) large flock swimming/foraging near the shoreline at Mono Lake, tufa formations in the background, late July, Mono Lake, California, USA. July.
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Marie Read / Wilson's Phalaropes (Phalaropus tricolor), flock flying over tufa formations at Mono Lake, just after sunrise, California, USA.
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Marie Read / Wilson's Phalaropes (Phalaropus tricolor) large flock swimming/in flight near the shoreline at Mono Lake, tufa formations in the background, late July, Mono Lake, California, USA. July.
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Marie Read / Wilson's Phalaropes (Phalaropus tricolor), flock flying past tufa formations, Mono Lake, California, USA, July.
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Marie Read / Wilson's Phalaropes (Phalaropus tricolor) large flock flying over tufa formations, late July, Mono Lake, California, USA, July.
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Marie Read / Violet-green Swallow (Tachycineta thalassina) male using its bill to preen its feathers, while perched on tufa, Mono Lake, California, USA
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Marie Read / Violet-green Swallow (Tachycineta thalassina) portrait of male facing camera, perched on tufa, Mono Lake, California, USA
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Marie Read / Violet-green Swallow (Tachycineta thalassina) male perched on tufa formation, Mono Lake, California, USA
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Marie Read / Violet-green Swallow (Tachycineta thalassina) female perched on tufa formation. This species nests in holes in the tufa formations. Mono Lake, California, USA.
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Thomas Lazar / Morning light on calcium carbonate Tufa towers in mineral rice lake waters, Mono Basin National Forest Scenic Area, INYO National Forest, California, USA, June 2008
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David Welling / Tufa towers and summer wavy grass on edge of Mona Lake NP, California, USA
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David Welling / Sun about to set over Tufa towers and summer wavy grass on edge of Mona Lake NP, California, USA
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Adrian Davies / Tufa towers, Mono Lake, California, USA
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David Kjaer / Tufa towers in Lake Mono, California, USA
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Tim Fitzharris / Wind and rain eroded tufa formations along shore of Mono Lake, California
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Tim Fitzharris / Wind and rain eroded tufa formations along shore of Mono Lake, California
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Gerry Ellis / Wind and rain eroded tufa formations along shore of Mono Lake, California
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Gerry Ellis / Wind and rain eroded tufa formations along shore of Mono Lake, California
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Gerry Ellis / Mineral tufa formations reflected in Mono Lake, California
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Gerry Ellis / Wind and rain eroded tufa formations along the south shore of Mono Lake, California
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Tui De Roy / Volcanic tuff formations on high Andean plateau, Mismi Mountain, Colca Canyon, Peru
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Doug Wechsler / Tufa towers of calcium carbonate formed by alkaline spring water. Mono Lake, California, USA
