In which U.S. state are these rocks, known as the "Chalk Pyramids", located?

These 70-foot-tall rock formations rise dramatically from the flat plains and grasslands of west-central Kansas, in the central United States.

The “Chalk Pyramids” a series of large chalk formations in Gove County, Kansas, are rich in fossils. They are also known as the “Monument Rocks”, and are estimated to be some 80-85 million years old.

Along with the nearby Castle Rock and Little Jerusalem Badlands State Park, these limestone formations are part of the Niobrara geologic formation. During the Cretaceous Period, the area was actually beneath an inland sea, and the rocks include many fossils of aquatic animals that lived in the region at that time.

As might be expected from the name, the landscape formations are fragile, since they are largely composed of relatively soft limestone, which readily surrenders to wind and rain. Humans may also cause damage; at the slightest touch, fingers can brush sand from the vertical walls, or thin rocks which have been in place for countless ages can flake away easily when hit with the toe of a hiking boot.

In January of 2008, the Chalk Pyramids, which lie 25 miles south of Oakley, Kansas, along with Castle Rock, 31 miles to the east, were jointly named as one of the 8 Wonders of Kansas.

The Nature Conservancy purchased the land in October of 2016 from a ranching family that had owned it for five generations, with a dual goal of protecting the area, while still allowing the public access to the mile-long chalk formations.