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Fossil fumaroles are cylinders of rock formed when gases rise through a pyroclastic flow. These can be seen near Tala, Jalisco.

Fossil fumaroles are cylinders of rock formed when gases rise through a pyroclastic flow. These can be seen near Tala, Jalisco.

© John Pint, 2011

Source article: Tala, Jalisco: A thousand-year-old Mexican city inside a geological wonderland
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