Tui De Roy / Cerro Azul caldera with lake and tufa cone at 5,900 feet, Cerro Azul Volcano, Isabella Island, Galapagos Islands, Ecuador
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Pete Oxford / Kicker Rock or Leon Dormido is an eroded tuff cone whose sheer sided cliffs are frequented by Boobies, Frigatebirds and tropic birds, Galapagos Islands, Ecuador
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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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Gerry Ellis / Sunrise on tufa formation on the south shore of Mono Lake, California
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Tui De Roy / Galapagos sunset with Kicker Rock, an old eroded tufa cone, San Cristobal Island, Galapagos Islands, Ecuador
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Tui De Roy / Kicker Rock, an old eroded tufa formation with tour vessel, near San Cristobal Island, Galapagos Islands, Ecuador
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Tui De Roy / Pinnacle Rock, tufa cone formation and volcanic beach, Bartolome Island, Galapagos Islands, Ecuador
