tell the water you love it
Traditional homeland of the Ho-Chunk
Blue Mounds, Wisconsin, USA
The limestone from which the cave was carved began forming approximately 488 million years ago, during the Ordovician Period. During this time, much of North America was covered with warm, shallow seas. Over millions of years, calcium carbonate shells from tiny marine organisms accumulated on the sea floor, forming enormous quantities of limestone. The cave began forming about a million to a million and a half years ago, in a manner similar to many caves. A large crack in the surface of the rock, called the cave's "lifeline", allowed rain water to seep into the stone. Over time, large cavities were dissolved in the stone and as the water table dropped, the water drained out and the cavities filled with air.