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American Geosciences Institute

National Fossil Day™ - Explore Nature

Smithsonian Museum of Natural History

Smithsonian.com - Mineral Gallery

Geology.com - What is Petrified Wood? How Does it Form?

The Effectiveness of Petrified Wood as a Geobiological Portal to Increase Public Understanding of Geologic Time, Fossilization, and Evolution

Click here to download pdf file.