Mushroom Rock State Park

It has Dakota sandstone concretions much like Rock City, but here most are not nearly as exposed. There could be a great many concretions at this park, but almost all are still covered by the surrounding soil and only a portion is seen. The underlying rock is softer sandstone and is eroding away, but some of it still remains and has been supporting three of the rocks for many years.

The resulting combination of rocks have a mushroom shape.