The trees in Northern California’s Petrified Forest are quite literally frozen in time. This unique site in Calistoga near Napa Valley is the result of a violent volcanic explosion that occurred 3.4 million years ago. Here are some incredible things about the Petrified Forest.

Mount St. Helena, a now-extinct volcano near the Petrified Forest, erupted and knocked down the forest of Redwood trees.

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Volcanic ash quickly buried the trees, creating an anaerobic (oxygen-deprived) environment in which decomposition could not take place as normal.

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Now, thousands of millenia later, those trees are still preserved where they fell all those years ago.

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Even the most minute details of the wood were preserved, making this a true ecological phenomenon.

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The species of Redwood trees found in the Petrified Forest is now extinct, but because of the volcanic eruption, they are forever preserved here for all to see.

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The Petrified Forest was first discovered in 1870 by a Swedish homesteader who discovered an old hollow log that was as hard as rock.

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Today, archaeologists study the Petrified Forest as a window to the past that lets them learn about environments that are long gone.

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In addition to the Petrified Forest, lots of beautiful flora can be seen in the area, making this an even more scenic destination.

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The Petrified Forest is one of many pieces of evidence of California’s volcanic past. For more spots where you can spot volcanic ruins, check these out.

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