Various parts of the Petrified Forest have logs showing different sorts of mineralization depending on what the content of the surrounding mud and ash were. This spot crystalized agate into the structure of the wood.

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Sunset Crater is the largest cinder cone in the volcanic field to the east of the San Francisco Peaks. It was formed quite recently in geologic times, during the time when the area was populated by Native American tribes. The eruptions that formed the cinder cones, spatter cones and surrounding lava flows feature prominently in their oral history.

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