“An enchanted spot…to stand on the glass of a gigantic kaleidoscope, over whose sparkling surface the sun breaks in infinite rainbows.” ~~Charles F. Lummis, Some Strange Corners of Our Country – A Forest of Agate, 1891.
The Petrified Forest National Park is home to a large region of the Colorado Plateau filled with shards and fallen logs of petrified wood. The fossils have been dated to the Late Triassic period, approximately 225 million years ago.
In the National Park, most of the logs in the park have retained their original form as they petrified, but internal structure was worn away by the elements. A few of the logs and some of the collection of petrified animal bones have cells that retained their original organic structure even though the structures were mineralized.
Much of the park’s petrified wood is from Araucarioxylon arizonicum trees, though at least nine species of fossilized trees have been identified in this petrified forest. All of these species are now extinct.
The International School of Gemology presents an informative and in depth explanation of how wood becomes petrified.