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    The "cannonball" concretions of Rock...
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    by basstbn Written Feb 10, 2010

    The road signs you see in central Kansas advertising Rock City give the impression that Rock City is little more than one of your typical, schlocky, roadside tourist traps. I am pleased to report that it is more than that. In fact this site is significant enough to be designated a National Natural Landmark.

    Surrounded by the rolling, expansive Kansas prairie, Rock City consists of approximately 200 rounded boulders, calcite-cemented concretions, popularly called "cannonball concretions." The largest of these are 27 feet (approximately 8 meters) in diameter. Guests are free to walk amongst the formations. The park has a visitor center and picnic tables. This is not a state or city park, but is owned and maintained by a non-profit organization which charges a small entry fee.

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