Ranger Sarah at Monument Rocks series of large chalk formations in Gove County, Kansas, rich in fossils.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah walks along the towering walls at Monument Rocks.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah is impressed with this formation that stands tall in an area of flat ground in western Kansas.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah spots a small arch at Monument Rocks. The chalk formations reach a height of up to 70 ft (21 m) and include formations such as buttes and arches.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah explores more of the chalk formations. The formations were the first landmark in Kansas chosen by the U.S. Department of the Interior as a National Natural Landmark.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah turns a corner and finds more cool formations. The carbonate deposits were laid down during the Cretaceous Period in what was then the Western Interior Seaway, which split the continent of North America into two landmasses.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah with another view within Monument Rocks which are are estimated to have been formed 80 million years ago.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah heads towards a arch. On January 29, 2008, Monument Rocks, 25 miles south of Oakley, Kansas, and Castle Rock, 31 miles to the east, were jointly named as one of the 8 Wonders of Kansas.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah takes in the view. While Monument Rocks can reach up to 70 feet above ground. The chalk formation continues down up to 300 feet below the surface.
— at Monument Rocks Chalk Pyramids Kansas.

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The exploration continues at Monument Rocks. This natural formation was created during the late Cretaceous Period of geologic history.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah is amazed that every inch of rock here represents 700 years of history!
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah learns more about Monument Rocks and other sites nearby. Read the sign at https://www.hmdb.org/m.asp?m=268941
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah takes in more of the formations. The sides of Monument Rocks show layers of iron, gypsum, bentonite, and giant clams.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah notices different colors in the chalk formations. Mineral content colors the chalk into various hues.
— at Monument Rocks Chalk Pyramids Kansas.

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Ranger Sarah enjoys the breeze as she explores Monument Rocks, which are part of the Smoky Hill Chalk Member of the Niobrara Chalk formation.
— at Monument Rocks National Natural Landmark.

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These chalk formations formed as oozy sediment that settled on the floor of a Cretaceous inland sea about 80 million years ago.
— at Monument Rocks National Natural Landmark.

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The Chalk that makes Monument Rocks were built slowly. Deposited at a rate of about 0.036 mm, or 0.0014 inches, per year, the sediment accumulated to a height of several hundred feet over millions of years.
— at Monument Rocks National Natural Landmark.

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Ranger Sarah looks back at the first section of Monument Rocks she explored. Fossils are not as common at Monument Rocks as they are in other sections of the Smoky Hill Chalk Member.
— at Monument Rocks National Natural Landmark.

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The towers at Monument Rocks are still standing due to this area having a more resistant bed of rock on top that had been cemented, likely by a dissolved mineral "glue," which helped shield the softer layers below.
— at Monument Rocks National Natural Landmark.

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