Two Top and Big Top Mesa
Two Top and Big Top Mesa are two adjacent mesas about  apart in western North Dakota. They were declared National Natural Landmarks in 1965. The tops of the mesas are rare examples of undisturbed grassland which have never been grazed or cultivated. They are located in or around the Little Missouri National Grasslands. Geology
Big Top mesa is approximately  while Two Top is around . They rise about  above the badlands. They are made of sandstone, Morton silt loam and clay. References

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National Natural Landmarks in North Dakota
Protected areas of Billings County, North Dakota
Mesas of the United States
Landforms of North Dakota
Landforms of Billings County, North Dakota