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Rock City, Minneapolis
(4/5 based on 60+ reviews on the web)
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
  • if you've never been you will be amazed at all the rock formations and things they have a good day souvenir shop there's a lot of rounds with people's names and dates they were there 
  • This was really interesting to see...I always do research before each trip, and understood the geology of the rock formations. I was able to explain the origins of the formations to the kids before we...  more »
  • Great for kids to get out of the car and just explore. They keep the area clean and the rocks are truly a fun place to let your kids explore and let loose.