These eruptions blanketed the area in volcanic ash with a high silica content. Fallen trees and broken branches were often buried by Up to 9 feet in diameter and 200 feet tall lived and died in these lowlands. Rivers flooded by tropical rain storms washed mud and other sediments into the lowlands. About 225 million years ago, this area was a lowland with a tropical climate and covered by a denseįorest. The most famous locality for observing petrified wood is Petrified Forest National Park near the community of Holbrook in This specimen shows the growth rings, cellular structure, and external bark.
Petrified wood: A nice piece of petrified wood representing a limb cross section. When the Chinle weathers away, the log will be lowered to the ground surface. At the top of the gulley, a "pedestal log" is suspended on a column of Chinle Formation. Petrified logs: An accumulation of petrified logs in a gulley at Petrified Forest National Park. These specimens with near-perfect preservation are unusual however, specimens thatĮxhibit clearly recognizable bark and woody structures are very common. Some specimens of petrified wood are such accurate preservations that people do not realize they are fossils until they pick The result is a fossil of the original woody material that often exhibits preserved details of the bark, wood, and cellular structures. With silica, calcite, pyrite, or another inorganic material such as opal. Then, groundwater rich in dissolved solids flows through the sediment, replacing the original plant material It forms when plant material is buried by sediment and protected from decay due to oxygen and organisms.
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