stratigraphy …

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… in Badlands National Park in South Dakota, USA.

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vanishing terrain …

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… in Badlands National Park in South Dakota. Geologists say the Badlands erode about an inch every year. That means the Badlands, currently about 500,000 years old, will be gone in another 500,000 years. Geologically, that amount of time is just a blink of the eye.