The Zion-Mount Carmel Highway running through Zion National Park, Utah, guides park visitors past ancient cross-bedded sand dunes. Can you tell which way the wind blew to create these now-lithified sand layers?
An ancient, cross-bedded sand dune, Zion National Park
![An ancient, lithified cross-bedded sand dune seen along the Zion-Mount Carmel Highway in Zion National Park, Utah](https://www.nationalparkstraveler.org/sites/default/files/styles/panopoly_image_full/public/photos/potw/zion_rebeccalatson_n6a3273_ancient_cross_bedded_sand_dune.jpg?itok=tHmi9Pcn)
Rebecca Latson
Monday, April 22, 2019
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