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Rock City, Minneapolis

(65+ reviews on the web)
Geologic Formation Nature / Park
Rock City is a park located on hillsides overlooking the Solomon River in Ottawa County, Kansas. It is 3.6 miles south of Minneapolis, Kansas and just over 0.5 mile west of Kansas highway K-106 and the Minneapolis City County Airport on Ivy Road. In a patch of prairie about 500 meters (1600 feet) long and 40 meters (130 feet) wide, Rock City contains three clusters of large spherical boulders. These three clusters contain a total of 200 spherical boulders. It has been designated as a National Natural Landmark.The park, owned by a non-profit corporation, has a visitor center and picnic tables. A small admission fee, which is used to maintain this park, is charged.The remarkable size and spherical shape of these rock formation was first noted by Bell. Later, these boulders were either noted or described by Gould, Landes, Shaffer, Ward, and Swineford. Shaffer was the first person to map the distribution of these boulders at Rock City and investigate their petrography in detail.Physical characteristicsThe large spherical boulders in Rock City are giant calcite-cemented concretions, typically called "cannonball concretions" because of their shape. They range in diameter from 3 to 6 meters (10 to 20 feet) with the average diameter being 3.6 meters (12 feet). These concretions lie 2 to 8 meters (6.6 to 26 feet) apart. Similar giant calcite-cemented concretions have also been found in a quartzite quarry within Lincoln County and in exposures of the similar age sandstones in Utah and Wyoming.
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Reviews
TripAdvisor
  • I was told about Rock City while in Marysville, KS for a high school reunion. The limestone concretions formed when Kansas was part of the Great Inland Sea are well worth a stop. Some shaded areas for...  more »
  • This location is very neat. The most and largest rock formations of this type in the world. Concretions are formed from grains of sand that were 'cemented' together over years and years when Kansas wa...  more »
  • It's worth driving off the beaten path to visit if you have the time and want something different to see. The $3 entry fee helps to keep the place going. The recent addition of restrooms is a true upg...  more »