The Ginkgo Petrified Forest State Park is located on the barren rocky hills overlooking Wanapum Reservoir on the Columbia River. The area has an unusually high number of rare petrified wood trees, which were gradually formed when trees were buried in lava flows and then slowly transformed over thousands of years through the infiltration of silica and minerals. Taking on the shape of the wood and the colors of the minerals, the tree stumps became rock.
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