This grouping of chalk and limestone monoliths are sedimentary remains of the Western Interior Seaway that covered much of the central Untied States during the Cretaceous period around 80 million years ago. Located near Oakley, Gove County, Kansas these chalk pyramids and towers are part of the part of the US National Park Service, but sit on private land and are accessible to the public.

圖片編號： 224451430
拍攝者： Tyeokum