アメリカ内務省のインスタグラム(usinterior) - 11月21日 01時23分

Here are some fall colors that won’t fade away. At #PetrifiedForest National Park in #Arizona, 200-million-year-old petrified logs lie strewn across rolling clay hills. Each piece is like a giant quartz crystal. As impurities like iron and carbon oxidized, they permanently colored these ancient trees shades of red, yellow and purple. It’s a rare and beautiful sight that you’ve got to see for yourself. Photo @petrifiedforestnps by #NationalPark Service. #FindYourPark #usinterior

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