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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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 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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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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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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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 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 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 is amazed that every inch of rock here represents 700 years of history!
— 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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