The tallest sandstone formations in the world appear to be in Zion National Park, which is located along the edge of the Colorado Plateau. Over the past 240 million years erosion from surrounding mountains created layers of sediment so heavy that the basin sank, and Zion’s elevation eventually rose from sea level to 10,000 feet. The bottom layer of rock at Bryce Canyon is the top layer at Zion, and the bottom layer at Zion is the top layer at the Grand Canyon. Ball’s Pyramid, the tallest volcanic formation in the world, is in the Lord Howe Island Marine Park in the Pacific Ocean. It stands 1843 feet (562 meters) high, and formed millions of years ago.
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