Petrified Forest National Park in northeastern Arizona protects one of the world's great concentrations of petrified wood — fallen logs that, over more than 200 million years, were buried, sealed off from oxygen, and slowly turned to almost solid quartz. The National Park Service explains that mineral-rich water, including silica from volcanic ash, crystallized inside the wood and replaced the original organic material. The result is stone logs banded in a rainbow of colors, set within the wider Painted Desert.
Best season — Spring and fall (milder desert temperatures)
At a glance
The facts worth checking before you roll out
Conservative, source-minded facts for planning your visit — always worth confirming against current conditions before you travel.
State
Arizona
Managed by
National Park Service
Age of the fossil wood
Over 200 million years
Composition
Almost solid quartz
On the ground
According to the National Park Service, the logs here were buried quickly and deeply enough that sediment and debris cut off oxygen and slowed decay. Over centuries to millennia, minerals — including silica dissolved from volcanic ash — soaked into the porous wood and crystallized within its cellular structure, replacing the organic material. What's left is a fossil that is almost solid quartz but still shows the shape of the original tree.
The color is part of the wonder. The NPS notes a rainbow of hues produced by impurities in the quartz, such as iron, carbon, and manganese, and explains that cracks in some logs filled with large jewel-like crystals of clear quartz, purple amethyst, yellow citrine, and smoky quartz.
The park also spreads into the Painted Desert, layering deep-time geology over open Arizona scenery. Confirm current road, visitor-center, and access details on the National Park Service site before planning your RV route.
Official sources
- National Park Service — Petrified Forest National Park National Park Service
- NPS — What is petrified wood? National Park Service
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