Check the listing for details. Blue Forest Eden Valley Wyoming Petrified Wood large cut & polished specimen. Condition: New. Listed at 275.00 USD. Blue Forest Wyoming Petrified Wood large cut & polished specimen Great colors, cut, polish, structure, combinations. Approx size: 7" x 8.55" x 2.5"Approx Weight: 8 lbs.Petrified Wood: Probably SchinoxylonCenozoic - Tertiary - EoceneFormation - Green River 50 million yearsPetrified Wood Collectors Worldwide consider Blue Forest Exceptional.This one is a fine example:Blue Forest Wyoming Petrified Wood SpecimenEden Valley Petrified Wood was formed from plants living about 50 million years ago . The rock exhibits features not found in fossil wood anywhere else in the world. The petrification process for this area involved shallow "algae growing" lakes. In many cases, for undetermined reasons, the wood came to be in this water in its live condition before it had a chance to dry out and look like old dead wood. This wood became coated with algae which adhered to the surface making a cast or mold around the wood. Later the wood dried and shrunk in the mold made of algae . Over time these algae casts became part of a layered rock formation. Silica-rich water solutions seeping through the rock then petrified the wood and filled in the spaces left between the dried wood and the hardened cast with agate, calcite, and quartz.Petrifying process: As the agate coated the inside surface of the algae cast, perfect impressions of the bark were left in the agate. Thus there are some rocks that show two 50 million year old "pictures" of the same plant -- one picture of how the plant looked alive and another after it died and dried out!Wormholes: Because the petrification process seems to have been "protected" by the algae cast formation, unusually detailed representations of the wood have been preserved. Lichens exquisite representations of bark both live and dried out have been preserved. Worm holes, insect borings, woodpecker holes, and other events have been observed in the petrified wood. Even very rare lichen fossils and small clam shells have been duplicated in the agate. Check out the store for other specimens Thank you.