アメリカ内務省のインスタグラム(usinterior) - 6月18日 00時19分

Sunrise over Badlands National Park in #SouthDakota reveals a landscape of grassy prairies and rugged rock formations. The rock layers testify to tens of millions of years of deposition -- when tiny grains of sediments such as sand, silt and clay are cemented together into rock. Different environments -- sea, tropical land and open woodland with meandering rivers -- caused different sediments to accumulate here at different times. About half a million years ago, the process reversed itself and now water and wind erode the rocks, leaving behind this jagged silhouette and its embedded #fossil treasures. Photo by #NationalPark Service. #usinterior #FindYourPark

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