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Gigapans

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  1. This roadcut perserves ripple marks that are now nearly two billion years old. Tilted during the Penokean Orogeny, these rocks are also some of the oldest redbeds (evidence of an atmosphere with free oxygen) in the world.

  2. Who passed this way?

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  3. South Channel of the braided Platte River, just east of Fort Kearney, Nebraska.

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  4. Three large slabs of sandstone displaying remarkably well preserved interference ripple marks.

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