Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Claudio Contreras / Hierve el Agua rock formation with calcified minerals, resembling a waterfall. Oaxaca, southern Mexico.
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Alex Hyde / Water seeping through moss in naturally formed tufa dam. Tufa is a kind of limestone, formed from the precipitation of carbonate minerals which builds up around the mosses (Cratoneuron commutatum and...
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees and frost covered grasses at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees at Canary Spring at dawn, Mammoth hot springs,Yellowstone National Park, Wyoming, USA, February 2013.
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Paul D Stewart / Elephant bird egg (Aepyornis maximus) 30cm compared to a Calliope hummingbird egg (Stellula calliope) 12mm. The Aepyornis egg volume holds around 7 to 10 litres, the hummingbird's a few millilitres. T...