Nature
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A five-ton section of a tree measuring 7½ feet in diameter came from an original tree estimated to have been 200 feet tall, part of a subtropical forest in what is now Colorado 55 to 70 million years ago. Scientists believe it was a redwood of the Sequoia species. In some prehistoric era, a cataclysmic upheaval caused silica-laden water to overspread the living forest, and over time the wood cells changed to sandstone while opals formed within the tree trunk itself.
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