The setting sun glows through a natural arch at Monument Rocks, Kansas. Once part of a vast seafloor over 80 million years ago, they are composed of chalk—a fine-grained, porous form of limestone made primarily from the shells of microscopic marine organisms. Recognized as a National Natural Landmark, Monument Rocks stands as a testament to the region’s deep geological history.
The setting sun glows through a natural arch at Monument Rocks, Kansas. Once part of a vast seafloor over 80 million years ago, they are composed of chalk—a fine-grained, porous form of limestone made primarily from the shells of microscopic marine organisms. Recognized as a National Natural Landmark, Monument Rocks stands as a testament to the region’s deep geological history.
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