High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Pompeys Pillar National Monument is a rock formation located in south central Montana, United States. Designated a National Monument on January 17, 2001, and managed by the U.S. Bureau of Land Management, it consists of only 51 acres (21 ha), making it one of the smallest National Monuments in the U.S. It was previously designated a National Historic Landmark on July 25, 1965. The pillar itself stands 150 feet (45 m) above the Yellowstone River and consists of sandstone from the late Cretaceous Hell Creek Formation, 75–65 million years ago. The base of the pillar is approximately 1 acre (0.4 ha). The pillar features an abundance of Native American petroglyphs, as well as the signature of William Clark, co-leader of the Lewis and Clark Expedition. Clark's inscription is the only remaining physical evidence found along the route that was followed by the expedition.

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